Powershell script to logoff user from all computers he is logged on to in domain (query domain controllers)

Hi,

I'm looking for a powershellscript which checks for a certain user AD user, then logs them off from all computers in the domain.
You can query domaincontroller logs for a user, then find the computer and execute a logoff. Why needed? His account is locked and he logged on to several devices, which locks the account again and again.
Had some kind of script,  don't find it anymore.

Thanks!