coming unhinged

The other day I came home to find that the door to our utility room had been removed at the hinges. I asked what had happened since the door was in place when I had left for work that morning.  My oldest daughter went into a panic because Eli had locked Addie in the room and she didn't know how to open the door.  I purposely put the lock on the inside so that if someone was washing clothes and someone else (Eli) happened to close the door, the person on the inside could unlock the door (this also works if Eli is the victim of his big sisters wanting him locked in).  I wonder if they make safe doors for dogs? I also wonder if Addie felt safer knowing that Eli couldn't get in?