The key won't turn do to the steering wheel being locked it has locked in a position that has placed the key switch in a hard bind which of course is preventing it from turning. And usually turning and holding the steering wheel hard to either the left or right and turning the key at the same time will usually unlock it.
Try it again and this time turn the key a little harder and see if it will unlock. Try both directions.
Make sure you are pulling on the steering wheel hard to either right or left while turning key.
Tuesday, January 4th, 2011 AT 1:37 AM