iphone 5s wont turn on

today i took my iphone 5S (which was recently fully charged) out of my pocket and it had a black screen. I tried pressing the lock and home button repeatedly yet no sound or picture appeared on the screen, not even the apple logo. It's been two hours and I have tried charging, connecting to my computer, and every pattern of pressing the lock/home buttons i could think of, yet my iphone shows no signs of working. The only thing is that it still feels fairly hot, which makes me think it is ON and maybe the screen and sound arent working?? Any help would be greatly appreciated.