When we were little, my parents told us to keep our bedroom doors unlocked at night in case there was a fire and responders needed to get to us. Maybe her Mom told her the same thing and she got it confused with her front door too? LOL. That's the only way I can see it. My almost 3 yrs old starting unlocking and opening the front door about 6 months ago....and just Friday my new daycare boy tried to unlock and open the front door to go see the backhoes building a house across the street from me....scary! It's exactly why I have a safety latch up high, so in case I'm in the bathroom they will not be able to get outside.