Stuck in Park!!!!!!

I have a 2007 impala and it is suck in park! I went to work with no problem then a half hr later i went to the store and when i got back in it started up but the button on the shifter is stuck and it wont move from park and its not on a curb or anything the steering wheel moves but still stuck please help barely makin payments cant afford the shop>>>>>>>>

Isn't it still under warranty?