2001 Saturn L300 My key will not turn

try a new key, yours may be bent.

if not try lubing up the key and the ignition tumbler really good with graphite lock lube and hit it with your hand a few times, insert key and try to turn it.

also try to turn the steering wheel hard left then turn it, then hard right then turn it, then shake the wheel and try turning it.

if none of that does it, its time for a new ignition tumbler.