[Grouch]

One trick that you haven't tried is move the key in and out very quickly with a little force. Just don't push too hard or you may damage the lock. If that doesn't work go to Office Depot or any big office supply and ask for some keyboard cleaner witch is nothing more than compressed air Shoot the air into the lock and move the key in and out. That should dislodge anything in the lock. If that doesn't work the lock is broken or the key is cut wrong. Hope you get it out