hi there, is the steering wheel locked?
let me know please.
does the key go in and out of the ignition ok?
two questions for you
have you tried a different key? a spare key?
what year and model is this car?
well if the steering wheel is not locked
we at least know the interlock is not preventing you from turning it
it's liekly the ignition tumbler assembly itself
assuming the vehilce is in PARK
and not in between gears or something