1975 Chevy Corvette

1975 Chevy Corvette V8 Automatic

My shifter felt unusually stiff so I moved it full forward and back a couple times which seemed to loosen it up before I took a drive. After I get home, I tried to put it in park but my car rolled back instead, making a clanking noise like it was trying to catch but couldn't quite. So I tried again but this time I held my shifter as forward in park as I could till it did catch. Then my key wouldn't come out of the ignition as if it wasn't in park. Last thing I noticed is that my shifter seems to want to push back now like when I go from park to drive it practically does it by itself once I press in the detent. The car still drives normally and all, just those couple consistant issues, so any suggestions would be welcome. Thanks