For any employment in which the minimum wage is applicable, the director of the department of labor may issue to an apprentice or learner a special license authorizing the employment of such apprentice or learner for the time and under the conditions which he determines and at a wage less than the minimum wage established by this act. Apprentice or learner shall include a student or students enrolled in a bona fide secondary school program administered by an accredited school district which includes work training experience. The director may hold such hearings and conduct such investigations as he shall deem necessary before fixing a special wage for such apprentice or learner.