Someone posted this solution already,but I wanted to document my same problem. We have a 2004 Pontiac Aztek and the key gets stuck in the ignition. I looked on this web site and someone stated the solution vs. repairing it is to insert a screwdriver type object underneath the steering wheel and release the key. You have to pull off the round rubber cover over the small hole, insert the fat, (we use a squared off screwdriver) and turn the key and it releases. Works perfectly.

Thanks to the previous poster of this solution. I don't know how much it cost to repair but believe it is expensive.