Iphone 7 plus freezes while launching a game?

I just baught my iphone 7 plus today and I was launching a game (pes2017 if helps) and suddenly my phone just freezed on the lock screen. I tried to restart or shut it down but it didn't work. But the notification center and the control center do kinda work but I can't open apps like camera etc. I would appreciate if anyone could help me with this problem.

Huh

Try hard resetting your iPhone 7 by pressing the lock/wake button at the same time holding down the volume down key. Keep holding it until you see the Apple logo and your phone should be good as new.

You buy a $700 phone to play games on? Really? Get a life. What is the world coming too

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