iPhone Frozen what can I do?

Depending on your iPhone model:

On an iPhone 8 or later (including the SE):

• 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.

• On an iPhone 7 or iPhone 7 Plus: Press and hold both the Side and Volume Down buttons for at least 10 seconds, until you see the Apple logo.
• On an iPhone 6s and earlier, iPad, or iPod touch: Press and hold both the Home and the Top (or Side) buttons for at least 10 seconds, until you see the Apple logo.

Then you didn’t do it right. Those are instructions for a forced restart. It’s like powering off the phone and turning it back on.