No minor under fourteen years of age may be employed or permitted to work in any occupation except farm labor, domestic service, or in the employment of, and under the direct supervision of, that minor’s parent, guardian, or grandparent. Domestic service includes services of a household nature performed by an employee in or about a private home of the employer. No minor under fourteen years of age may be employed in any business or service whatever during any part of the hours when the public schools of the district in which the minor resides are in session.