It is illegal to employ a child under 14 except under specific circumstances. To be employed, a minor must have a work permit.Child labor laws limit the hours workers under 18 can work and the kinds of jobs that they can do. In the US, all employment is "at will" unless under a union contract. "At will" means they can fire you for any or no reason at any time. According to Colorado child labor laws, minors may not work more than 8 hours per day or 40 hours per week. Child labor laws limit the hours workers under 18 can work and the kinds of jobs that they can do. Washington State and federal laws spell out which jobs are prohibited. All minors under 18 are prohibited from doing the following work in any industry. All minors (workers under age 18) who work in.