One possibility is to give the WDF business to current employee.
The employee becomes a business owner (the WDF) instead of an employee , pays to use your machines like self-serve customers and provides his or her own supplies.
In return they still keep your store clean and semi-attended.
Now you don’t have the payroll/employee issues anymore yet have someone in the store to keep it clean and deal with customer issues. Now your former employee is a caretaker (at no charge) and a very regular self-serve customer.
Just a thought.