Lab Logout Pop Up

Greetings,

Running into a scenario in our Mac Labs where users are leaving their accounts logged in, requiring the next person to force reboot the computer. I know there's the option to force logout through a configuration profile based on idle time, but I'm hoping to give the option to log them out or cancel and log back in if the user is actually still around.

Anyone have any ideas on how to trigger a script when the screen saver launches, or even better when the computer is brought back from screensaver and lands on the login screen?

I've tried playing with ScriptSaver, but can't get it to run with the privileges needed to force the logout.

Here's the script I put together:

#!/bin/bash

        PROMPT=`/Library/Application Support/JAMF/bin/jamfHelper.app/Contents/MacOS/jamfHelper -windowType hud -lockhud -heading "Force Log Out" -description "If a previous user has left a computer logged in, you can use the button below to force log them out. Be certain they are gone, as they
 will lose any unsaved work." -icon /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/GroupIcon.icns -button1 "Log Out" -button2 Cancel`
        echo "result $PROMPT"
        if [ "$PROMPT" == "0" ]; 
            then
                pkill loginwindow  

        else
            exit 0
    fi


exit 0

I'm probably trying too hard to fit this scenario, and just need to use the idle log out, but figured I'd see if anyone had ideas to make it happen.

Open to any suggestions, thanks!