My iPhone max is locked and won’t respond - power off comes on, does not respond
The power off button does not respond when I try to slide it to off. Restarts don’t work as power off button comes on, but doesn’t respond.
Try the steps in this article:
If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support
If that does not help your phone might need service:
Contact Apple for support and service - Apple Support
Good luck!