One time I came home from the shops with my two daughters, 3 and 6 months. I lifted them both out of the car and put them in the house. Put my house keys on the shelf beside the door and went to get my shopping. My 3 year old shut the house door. I spent 15 minutes with my hand in the letter box trying to coax a frightened 3 year old to give me the keys. No one was about and I had no mobile phone. She gave me the keys eventually and everyone was safe.
I'm not a bad person and neither are you.