IPhone 4S sleep button doesn't work?

Today I helped my sister move and I left my iPhone 4S in the console of the car so it wouldn't get too hot or anything. After about 2 hours of moving I went to check my phone and the sleep button won't work anymore. I have never dropped the phone or gotten water damage, it's in perfect condition. What do I do? I'm afraid apple won't replace my phone!

Added (1). To clarify: The button is not stuck. It still has its "click."

Ask apple after sales department for help.

Anyway, can kindly check the bluetooth keyboard for iPad at