Anyone concerned about someone handling their laundry can tape a sign to the machine that says "If landry has finished before I return, please call me at (phone number)"
No note = take out the laundry for them so you can use the machine.
Back when we used CG laundries, we must have left one of our signs on a machine. Several months after we'd left that CG, I got a call telling me my laundry was done and the washer had stopped. :)