My 2000 Ford Taurus won't shift from neutral to reverse or neutral to park?

Its curently in neutral but the steering colum shifter will go down to drive or drive 2 and will go back to neutral, but then it stops so I can't back up or park the car.since it doesn't go into park, I can't even take the keys out of the ignition. Any ideas?

Sounds like a shift cable problem

Stuck mechanical fialure

Check motor mounts and or shift cable.