That all persons, firms, or corporations employing children under sixteen (16) years of age in any of the vocations mentioned in this act, shall be required to first obtain and keep on file and accessible to any inspector or officer charged with the enforcement of this act, the work permit as hereinafter provided for: Provided, That if such children are enrolled in or attending any secondary school within the state, no such work permit shall be required.
K.S.A. 38-604