Closing shifts have the same responsibilities as any other shift, with a few extras.
Check supply caddies, paper, ink/toner, tissues, etc.
Notify users ~15 minutes before close, and again 5 minutes before*
Clean up
Straighten chairs, mice, monitors, and keyboards
Set the alarm*
Turn off appropriate lights*
Close the door
Leave computers on
Turn the printers off*
In 24-hour labs, put up the “Lab op is away for the night” sign
*These responsibilities do not apply to 24-hour labs.