mac pro m1 lock screen stuck

Hi stucklockscreenmacpro,

Thanks for posting in Apple Support Communities.

With your Lock Screen frozen simply press and hold the power button for about 10 seconds until it turns off and turn it back on. If ti continues to freeze or it restarts, running Disk Utility to check the health of the disk and repair it would be best.

If your Mac is stuck on this screen or keeps restarting

If startup never progresses beyond an Apple logo or progress bar:

1. Press and hold the power button on your Mac for up to 10 seconds, until your Mac turns off.

Every Mac has a power button. On laptop computers that have Touch ID, press and hold Touch ID.

2. Turn your Mac back on. 

3. If the issue persists, press and hold the power button until your Mac turns off. Then unplug all nonessential accessories from your Mac, including printers, drives, and USB hubs. You could have an issue with one or more of those devices or their cables. 

4. Turn your Mac back on.

5. If the issue persists, once again press and hold the power button until your Mac turns off. 

6. Repair your startup disk as described in How to repair a Mac disk with Disk Utility.

7. If the issue persists, reinstall macOS from macOS Recovery.

If you need help, contact Apple Support.

These steps can be found in If your Mac starts up to an Apple logo or progress bar.

Regards.