My front hallway is closed off by a door to my front room. So, it's literally a seperate room. I lock my front door... all the time! The only time it's unlocked is at pick up or drop off. I hate the thought that a parent would just wander in my home during the day unexpected. I have a strict "don't bother me" policy from 12 - 3 for proper quiet time.

I would not be concerned about the kids trying to leave out the front door if it was unlocked. I would be more concerned about someone coming in!

I spend my day home along with children that I am fully responsible for. My door is locked for safety.