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I'm not sure if a 5-minute session really makes sense for testing. Maybe consider setting up jailroot accounts for testing with limited tools available and do not bother about logouts. Maybe rather have a script to check inactivity, if the test user didn't logout properly, but isn't using the account - only then do a logout.
The 'who' command will provide a list of logged users. You will certainly need a script to sort out the list (maybe with grep) and to check for multiple logins with the same name. Put the script reference in the user account's .bashrc or .bash_profile script to do the test and immediately log out again if the account is already used.