There's a bike cage at work. I've been parking in there because hey, it's nice to have dedicated bike parking, with a key code door and all that. And sometimes, I just wheel my bike in there and park it and walk away without locking it. Not all the time. I'm a little paranoid.
Which is probably a good thing. Because you should never assume that because a thing has a lock, it's secure. Try that lock out. Try to break it. A security system you can crack isn't a security system.
Yesterday, someone saw a man walk up to the bike cage, reach in through the wire, open the door handle from the inside, and get away with an unlocked bike:
Just like that.