Who are you keeping out?

So we are upstairs putting laundry away, cleaning their rooms together when I went to put some things in the bathroom to discover the door is locked.

Me: Who locked the door?

E: Me

Me: Why?

E: So 'M' (our 18 month old) doesn't go in.

Me: Well, now none of us can get in. Need to think in through just a little more before you lock a door 'E'. You had the right idea, but just shutting the door would have worked fine.

sigh... paper clip in hand and ready to spend time trying to get a door opened.