Won't go into, or out of? Which?
If it won't come out of park, it seems that the shift interlock is not releasing. The most likely cause is a concern with the brake light switch. This switch, located at the brake pedal, not only turns the brake lights on, but it also releases the shift lever interlock so you can move the lever out of park when your foot is on the brake.
A quick way to check for this is -- do your brake lights work when your shift lever will not come out of park?
Could be a switch or wiring at the switch.
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