What is the legality of an employer requiring an employee to perform tasks outside of work?

If you are an hourly employee, you must be paid for all hours worked (and be paid at the overtime rate as applicable, for hours over 40 in a work week). "Work" includes anything done outside normal duties, worksites, or shifts, if required by your employer--that is, if the employer makes you do it, it is work, and must be paid for it. If you are not paid for work which you have done, you could file a complaint with the state depatment of labor and/or bring a lawsuit; since many employment attorneys will provide a free initial consultation to evaluate a case, your first step may be to speak with such a lawyer.