Do a search on "tumbler". I went through a similar situation awhile back on my 300D. You have GOT to try to "work" the steering wheel back and forth until you can get the key to turn. Once you get it to turn - do not turn it back. Make sure you have the large paper clip or the proper tool, remove the tumbler and then be prepared to replace the steering lock.
You can put a drill bit to that hole where the key goes and it will not even scratch it.