> Little hard to lock the door with door chains while you're not in the room. A little hard, maybe, but I've seen a vid of some guy unlocking a door chain usin

> Little hard to lock the door with door chains while you're not in the room. A little hard, maybe, but I've seen a vid of some guy unlocking a door chain using a rubber band, coat hanger wire and a stick. So I guess that with a little effort locking the door from outside is possible.