I feel really stupid. I bought 2 MasterLock 911 Contractor Grade Weather tough locks today. I opened the first package, put the key in, turned it and the shackle doesn't pop up. I thought maybe this one was broken. So, I opened the next package, same problem. That makes me think I"m doing something wrong. I can't for the life of me figure out where there's a release or some other trigger for getting this open. This is the type of lock: http://doityourself.com/store/6638332.htm The black bib doesn't slide up or down. There's nothing else that moves that I can see. It's just beyond me? I've turned the key so hard, I'm afraid I'm going to break it or my finger trying. Please help.