(a) Any person who knowingly uses an adult in forced labor is guilty of a felony and, upon conviction thereof, shall be imprisoned in a state correctional facility for an indeterminate sentence of not less than three nor more than 15 years.
(b) Any person who knowingly uses a minor in forced labor is guilty of a felony and, upon conviction thereof, shall be imprisoned in a state correctional facility for an indeterminate sentence of not less than five years nor more than 20 years.