If you are hired as a part time employee no. If you are a full time employee then yes. You are by state law able to be mandated without notice HOWEVER There are rules to mandating you for example: 1.) OSHA & federal law require all scheduled shifts be at least 8 hours apart. So if you close but open the next day and there aren't 8 hours between the time you clock out and need to clock in this isn't legal. 2.) All overtime must be paid at 1.5 times your usual rate and overtime cannot exceed more than 10 hours in one week.