Ignition System for Saturn L-Series "problems sl2" Questions

Help! 2007 chevy impala stuck in park and the key wont come out. I have a 2007 chevy impala that is locked up. AIt will not go into any other gear. it is not the transmission. the key won't come out ...

I have a 96 saturn SL2.. one morning key wouldnt turn.. took ignition cyclinder out within 20mins.. been trying to put new one in for 2 days! What am I doing wrong Insert key into new cylinder.Rotate ...