I'm embarrassed to admit this, but I broke down my own door last year. I stepped outside to take out the trash and shut the door so the cat wouldn't run out, locking it out of habit. I was barefoot and it was freezing out. So I threw my shoulder against the door 3 times until it broke open. Steel door, but the wooden frame split apart easily. It made me think, "Shit, anyone could do that."
I think home security is pretty hopeless now. Altalp has made me realize that all locks are futile. There's really not anything you can do to keep people from breaking in. Unless I want to buy an attack dog or something. Which I don't.