key will not come out of ignition

could be a worn key lock cylinder or the shifter interlock is not going all the way into park. With your foot on the brake and the car off ,try to move the shifter from lower gear back to park with a little speed in mvoing the shifter.Or you can push on the shifter into the park postion ,then try to turn the key to the off postion and see if it will come out. If the key is in the off postion then the lock cylinder may be worn and not allowing the tumblers to release the key.