Iphone 6 works but screen has gone black?

Last night my iphone 6 randomly froze while i was on instagram so i clicked the power button and let it cool for a few minutes but after that the screen would not come back on. I tried calling my iphone and the iphone rang, the screen still black. Then i pressed down the home button and siri activated, but the screen was still black. Is there any way i can make the screen come back and everything back to normal? (i really don't wanna take it to the shop)

Go shop for warranty and scream at shop

Hard reset it. This happens randomly, it has happened to me 2 times, once on a 4s and once On a 5.

Press the power and home buttons at the same time and keep them pressed for about 10 seconds, after that, release the home button and it should restart.

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