Chosen Solution
I left my iPhone then came back out and I pressed the power button but it wouldn’t cone on . I even held the wake button by the side but it still wouldn’t come on . I tried charging it but it wouldn’t come on.
Try a hard reset: Hold home + power together for approximately 20s or until the apple logo pops up. If that doesn’t work then you may need to replace a failed component on the phone (Battery , Screen Ect)