OK. So my year Durango used a mechanical lock which is deactivated with the key is in the on position. There is a lever attached to the ignition that releases the locking pin on the gear selector.
I found a video describing the locking mechanism.
2001 Dakota locking gear selector
For now I put just a little bit of grease on the sliding bar and moved it back and forth. I really won’t know if this took care of the issue until we get some cold weather…
But at least the video showed how to get it unlock using my finger if it does happen.
thanks for your help.