Key Won't Work In Ignition

ignition
steering
locks
plymouth
keys

#1

I’ve got a vintage Mopar vehicle that’s suddenly developed a recalcitrant ignition lock.



I can’t key the key to turn on the ignition. I’ve jiggled the key in the ignition, played with the tranny shifter, sprayed WD-40 into the lock, all to no avail.



Any suggestions?