Ignition key won't turn!

[knarf]

I just got my 109E back from the shop. I had major front end surgery, alignment and state inspection.
Drove the car home parked it in the driveway, came out the next day to start it up and now my ignition key won't turn to unlock
the steering column.
I've had to replace the steering column lock in my 450slc that had a simular problem.
With the 109E would this problem be typically caused by the steering lock or ignition cylinder?

Thanks In Advance,

Knarf