Lock builtin laptop keyboard but keep an external USB keyboard functioning

xinput list

is there USB KEYBOARD ?

sample
 USB KEYBOARD                                id=15    [slave  keyboard (3)]
and so write



xinput set-prop 15 "Device Enabled" 0

xinput set-prop 15 "Device Enabled" 1
 

That works!

https://askubuntu.com/questions/819148/lock-builtin-laptop-keyboard-but-keep-an-external-usb-keyboard-functioning