Ignition Key Problem
 

When I put my car in park sometimes I cannot get the ignition key to turn all the way to off to get the key out. Some times you can hit the shifter foward with the heel of your hand and it will work Some times you just have to keep moving shifter back and forth hard and it will let you turn key to off and get the key out Any suggestions It is a 2001 S80 2.9 non turbo it does have 175000 miles could something be wore out?