Sticking in park

[Bowed]

2000 Silverado 1500 - Z71 - 5.3 - auto trans - push button 4wd - 122k mi

I did a search but was not able to find the info I need .

My gear selector sometimes misses a full engagement into park and the key switch will not turn counter clockwise enough to shut off the engine , with the switch stopping one notch above the off position . It might need 2 or 3 tries before it locks into park and the key can be turned fully to the off position . Sometimes it will also stick coming out of park and will require several tries to get it out of park and the column will clunk when it finally comes out . thanks for your help .