Gear shift stuck

I was pulling into my driveway. I put the car in park, but when i went to get out of the car, it started to roll forward. When I finally got it stopped, I tried to shift it, and it wouldn’t shift to any spot. Then it became stuck in between Park and Reverse. I can’t move the gear shift and I have no idea what to do. HELP!

What kind of make/model is it?
On many cars there’s a shifter override in front of the stick that you insert a key into to move the shifter without having to put a key in the ignition. Look in your manual.