Eons ago, I found out some apts. had the same key after a couple of times someone would open my door and IMMEDIATELY shut it before taking one step in. I had a furnished apt. so it would be similar to others but every time, people knew in a split second it wasn’t theirs.
So extrapolating this piece of information to all people, we can conclude that no one will ever step into an apartment by accident.
I think your extrapolation is not the same as proof.
People make mistakes. Some people are slower to catch on than others.