see if you can gently finesse the key in. If the key goes in a little, try to gently turn the key as you rock the steering wheel from its stops on the lock. It may be that when the key was removed the key switch just jammed and needs to be freed. Try using you finger, press on the key switch and try moving it around with you finger tip, if the tubler jammed this might free it up.
Don't call for a tow to get the switch changed unti you feel you have done everything you can do to try and free it yourself without damaging anything.
