RR,

As Norman says, stuck in this context means won't turn. And as Norman says, check the archives.

With the consequence being you or a garage taking a big drill to the ignition tumbler, I'd spend 15 minutes or more jiggling the key in the tumbler until it catches. If you're lucky and it catches, do NOT turn it back to the 0 position until the ignition tumbler is replaced. You should be able to move between 1, 2 and start with no problem. Just don't go back to 0. A sore forefinger is nothing compared to the headache and/or cost of breaking the ignition tumbler.

Sixto
91 300SE
87 300SDL
83 300SD