Child Labor Law regulates employment of workers under 16 years of age. The law protects children by: requiring employment certificates.The Act restricts the number of hours minors can work in a given workweek and workday. Working hours are limited for children under 16. Generally, employers cannot let children work before a.m. Requiring employment certificates. Illinois Child Labor Laws - Occupations Deemed Hazardous to Minors. Minors under the age of 16 MAY NOT WORK in any of the following Hazardous. The Child Labor Law requires minors, under the age of 16, to complete an Employment Certificate, prohibits working in hazardous jobs, and limits work hours. Employers of minors must post a schedule stating the hours of work and time of the lunch period.