If the key is in the lock you should keep trying to get it to turn, it could help if you where able to impart some vibration to the key as you applied some turning pressure at the same time. You could always head down to the local adult toy shop and tell them you needed a large industrial strength model for this purpose!!!!! But seriously locksmiths use vibrations to have the tumbler pins moving as they apply pressure turning the key, eventually the tumbler pins are lined up correctly and the key turns, Voila! Good Luck!