1998 Chevy Corvette My Car wont come out of park

I wasn't sure what category this would fall under. My car will not shift from park. I stay on the brakes to shift and it wont come out from park. The shift knob seems to be real tough and won't let the car shift away from park. Do you know if it will be covered under my extended warranty? Also would you happen to know any dealers in Chicago where I can get it serviced?