Hello Toooldforthis33
This has happened to me several times, since I bought my iPhone 14 Pro. Your phone is not dead. The screen brightness turned itself all the way down, to black. There’s a quick and easy solution to restore the brightness, on your screen.
On your iPhone 14, press and hold the button on the right side of the phone - It will engage Siri.
Ask Siri to turn up the brightness - literally say, “Turn up the Brightness.” Even though the screen is black, a slider will appear on the screen.
Slide the slider, to the right, to turn up the brightness on the screen.
It won’t stop the issue from happening again, but it works. You won’t have to reboot your phone.