I left my iPhone in the heat and it won't turn on?

I was playing tennis and I had my iPhone playing music and it was in my pocket. I had only been outside playing it for maybe 30 minutes or less. Then it just vibrated and stopped. So I put it in my car. The inside of my car was hot too so I know that didn't help. But now I can't seem to do anything to get to turn back on. I've tried recovery mode and everything I can think of. I even tried to charge it but it still won't work. It's been off for about 4 hours now! Any Advice?

Take it to your provider's store (Verizon, sprint, AT&T, etc… ) and tell them what's wrong with it they should help you