I have great co-workers, so it's not about them, but rather, the door is sometimes left open even when no one is inside. People who are around and passing the door are mostly co-workers, too, but sometimes there are strangers from outside or part time maintenance workers that we aren't familiar with. I don't want to make my co-workers feel I don't trust them by locking the bike, but OTOH I don't want to fall victim and lose my means of transportation. I'm tired of asking co-workers to close and lock the door when they leave.