My iPhone 6 won't turn on from sleep mode?

I've had it for like a year and 3 months and it's doing this. Is it a bug?
I can press the sleep/wake button or the home button several times but it doesn't respond. Anyone else having this issue?

If it's still under warranty, I would go to the Apple store and get that fixed or replaced. I never had that problem with any apple product I owned

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