For any occupation, the Department may provide by regulations, after public hearing, upon reasonable notice, at which any person may be heard, for the employment of learners and apprentices at such wages lower than the minimum rate under this chapter as the Department may deem necessary or appropriate to prevent curtailment of opportunities for employment. No employee shall be employed at wages fixed pursuant to this section except under applicable regulations of the Department. Such regulations shall, except as may be otherwise provided by the Department, take effect upon publication.