I had this problem under different circumstances. The lock cylinder turns a gear which moves a piece of metal with teeth, which is attached to the ignition actuator rod. For some reason or another, the gear jumped a tooth and wouldn't let the metal piece go all the way forward preventing the key from going back to the lock position. So I took apart the whole column and reset the metal piece on the gear so it can turn all the way. In hindsight I realized it would've been MUCH easier to pull the whole column out to do this but that's 20/20. Hopefully I've explained myself well enough, I could dig up a few pictures if that would make things clearer.