well, you can keep a list of users who have a habit to leave themselfes locked on.
I know from our corp that many do leave it like that but there is also some that do it because they will come back to office when everyone else is gone.
for the others you feel leave themselfes locked on for no reason, start setting their profiles.

anyway, to force a daily logon, woah...
there should no need for that. if you have a logonscript that needs to run daily... well, you should start building an admin script.
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