Just to add to this, have discovered the machine does lock eventually if left ideal. Seems to ignore the 20 minutes lock policy though 

I use pmset in a script to get what I want
https://ss64.com/osx/pmset.html
Will show you all the settings available.
Although a confi profile should be able to give you all of the same functionality.

Are you able to share what you are using.

Are using this in shared labs?

# Set display and system sleep times

/usr/sbin/systemsetup -setcomputersleep Never

/usr/sbin/systemsetup -setdisplaysleep 30

/usr/sbin/systemsetup -setharddisksleep Never

# Start and shutdown

#  Turn it off and back on again, to remove anything left in there

pmset repeat cancel

sleep 5

pmset repeat shutdown MTWRFS 21:00:00 wakeorpoweron MTWRFS 08:00:00

pmset -a darkwakes 0 womp 1 autorestart 1 sleep 0 disksleep 0 hibernatemode 0 displaysleep 30 powernap 0

/usr/sbin/systemsetup -setwakeonnetworkaccess on

/usr/sbin/systemsetup -setrestartpowerfailure on

/usr/sbin/systemsetup -setallowpowerbuttontosleepcomputer off

thanks i assume this would work on both intel and Apple silcon.

Yes I have this running on M1 and Intel