The door slams. You reach for your keys. They’re inside. So is your toddler. Or your dog. Alone.
This is a genuine emergency. Not because locks are dangerous—but because the vulnerable person or animal inside needs access to you, may be frightened, or could be at risk. Here’s exactly what to do.
Assess the Situation
Immediate Questions
Before acting, quickly assess:
Who is locked inside?
- Infant/non-mobile child
- Toddler/young child
- Older child who can follow instructions
- Pet (type and temperament)
What dangers might exist?
- Cooking or heating left on
- Accessible hazards (chemicals, medications)
- Hot weather (overheating risk)
- Duration since they last ate/drank
How long has it been/will it be?
- Minutes while you get help
- Potentially longer if help is delayed
If the Situation Is Urgent But Not Life-Threatening
Most lockouts are stressful but not immediately dangerous. A toddler locked inside for 10-15 minutes while a locksmith arrives is frightening but manageable.
Step 1: Stay Calm (Seriously)
Your panic transmits to those inside:
- Children sense your fear through voice and behaviour
- Pets respond to your stress
- Calm communication keeps everyone safer
"The person inside needs your reassuring voice more than anything else you can do in the first moments.
Step 2: Establish Communication
Talk to them through:
- The letterbox
- Open or cracked windows
- The door itself (small children may hear you)
- If an older child, call them on a device inside
For young children:
- Keep your voice calm and cheerful
- Tell them you’re right outside
- Ask them to sit somewhere safe
- Play a game (count to 100, sing a song)
For pets:
- Speak in normal, reassuring tones
- Dogs especially respond to calm voices
- Don’t shout or bang—increases stress
Step 3: Call for Help Immediately
While maintaining calm communication, call for professional help:
- Emergency locksmith (fastest option)
- If genuine danger, call 999 first
When calling a locksmith:
- Explain the urgency clearly
- Mention child/pet locked inside
- Ask for arrival time estimate
- Get a name and callback number
See our guide on lockouts at night for more on finding reliable help.
Step 4: Check Alternative Access
Before the locksmith arrives, quickly check:
- Other unlocked doors (back door, garage)
- Windows that are safely accessible
- Spare keys with neighbours
Only attempt entry if:
- It’s clearly safe (ground floor, easy access)
- It won’t cause injury to you
- It won’t frighten the person inside
Keeping Children Safe While Waiting
For Toddlers and Young Children
Keep them engaged through the door:
- Food games: “Can you go get your teddy and show me through the window?”
- Singing: Familiar songs are calming
- Counting: Give them a counting task
- Reassurance: Keep saying you’ll be inside soon
Keep Them Away from Hazards
Through the letterbox or window:
- “Stay in the living room with your toys”
- “Don’t go near the kitchen”
- “Sit on the sofa and watch for me”
Signs of Distress to Watch For
If you observe through windows:
- Excessive crying that won’t calm
- Signs of overheating (hot weather)
- Attempts to reach dangerous items
- Physical distress
If distress escalates, escalate your response—consider 999.
Keeping Pets Safe While Waiting
Dogs
- Keep talking—dogs respond to familiar voices
- Don’t make them excited (they may jump at windows)
- Check they have water visible
- Keep watching for signs of distress
Cats
- Usually self-sufficient for short periods
- Check through windows if possible
- Less likely to injure themselves from panic
Other Pets
- Small caged animals are usually safe short-term
- Reptiles in heated enclosures—note any temperature concerns
- Fish are fine for the duration of a lockout
What NOT to Do
Don’t Break Glass Unless Absolutely Necessary
Breaking windows:
- Creates dangerous shards that could injure those inside
- May frighten children or pets into running toward danger
- Often costs more than locksmith fees
- Leaves your home unsecured
Don’t Attempt Dangerous Entry
- Climbing to upper windows
- Forcing gaps you can’t safely fit through
- Using tools that could cause injury
- Entering through spaces that might collapse
Don’t Leave to Get Spare Keys
Unless someone else can stay:
- Don’t leave a young child alone without communication
- Even a few minutes of silence can escalate fear
- Send someone else if possible
Don’t Panic-Choose the Cheapest Locksmith
In this situation:
- Speed matters more than saving £20
- A responsive professional is worth premium pricing
- Don’t wait for multiple quotes—call and commit
After Entry: Lessons Learned
Once everyone is safe:
Immediate Comfort
- Reassure the child or calm the pet
- Check for any issues that developed
- Take a breath yourself
Prevention for Next Time
Key habits:
- Spare key with trusted neighbour
- Key on your person, not in the house
- Keyless entry consideration (smart locks with phone backup)
With young children:
- Never leave keys inside when stepping out “briefly”
- Attach key to your body when in the garden
- Consider a key safe for emergencies
Frequently Asked Questions
When should I call 999 for a child locked inside?
Call 999 immediately if there is fire, smoke, gas smell, if the child needs medical attention, if an infant is alone and help isn't coming quickly, or if anyone inside is in visible distress or danger.
How long can a child safely be locked inside alone?
It depends on age and environment. An infant should never be alone. A calm older child in a safe room for 15-20 minutes while a locksmith arrives is stressful but usually manageable.
Should I break a window to get to my child?
Only if there's genuine danger. Breaking glass creates sharp hazards that could injure the child and leaves your home unsecured. A locksmith is usually faster and safer.
Will a locksmith come faster for a child emergency?
Most locksmiths prioritise child/pet lockouts. Be clear about the situation when calling—it often affects response priority and speed.
Should I break a window if my dog is overheating?
If you genuinely believe your pet is in immediate danger from heat and help is not arriving quickly, breaking a window may be justified. Weigh the danger against the injury risk from glass.
What if I can't afford an emergency locksmith?
If there's no genuine danger, a friend with spare keys may be worth waiting for. If there is danger and cost is the barrier, consider breaking entry as a last resort.
How do I keep a child calm while locked inside?
Stay calm yourself. Talk through the letterbox or window. Sing familiar songs, play counting games, and keep reassuring them help is coming.
Can I leave to get spare keys while my child is locked inside?
Only if someone else can stay and maintain communication. Don't leave a young child alone without someone talking to them through the door.
Preparation Prevents Panic
Take action now before this happens:
- Give a spare key to a trusted nearby person - see our guide on spare key storage
- Save an emergency locksmith number in your phone
- Establish a habit of checking keys before closing doors
- Consider a key safe on your property
The five minutes spent on preparation could save you the worst 15 minutes of your week.