Cannot turn my phone off or open any apps

Johnny Lightning 691 wrote:

The Hard reset didn't work

The hard reset will always work if you do it correctly:

• Press and quickly release VOLUME UP
• Press and quickly release VOLUME DOWN
• Hold the SIDE button until an Apple logo appears (15-30 seconds), ignoring "slide to power off"

The operative word here is QUICKLY; and try it a couple of times, the timing is a little tricky.

If your iPhone won't turn on or is frozen - Apple Support

Try a Hard Reset:

1. Press volume up
2. Press volume down
3. Press and hold the power button until the Apple logo ( ) appears

The assumption both Smilin-Brian and Lawrence Finch have made is you have an iPhone 8 or later. You never told us your specific iPhone device.

Ah, caught! But it looks like our assumption was correct😁

Yes, indeed. A good outcome for all was achieved 👍