The duplicate link I added has some really good Apple Script options.
$ osascript -e 'tell application "System Events"
> keystroke "verysecurepassword"
> key code 36
> end tell'
I might also suggest using
LockScreen. It's a hidden application that comes preinstalled and is protected by System Integrity protection. It will put a lock icon on the screen, lock the keyboard and mouse, and freeze the Touch Bar (Sounds malicious, right?).
System Preferences > Security & Privacy > Uncheck "Require Password...."
To lock the Mac use
- To unlock the Mac use (non tested but should work)
$ killall LockScreen