Can minors work at corporations like mcdonalds, walmart or barnes and nobles?

In nevada the law doesn't say in particular that kids under 16 cannot work at corporations like mcdonalds, walmart or barnes and nobles?

is it corporate policy that says they have to be 16 or 18?

or is it the part of the law that says "Determination by Labor Commissioner that certain employment dangerous or injurious to children under 16 years of age. Except as otherwise provided in NRS 609.221, the Labor Commissioner may determine whether or not any particular trade, process of manufacture or occupation, or any particular method of carrying on such trade, process of manufacture or occupation is sufficiently dangerous to the lives or limbs, or injurious to the health or morals, of minors under 16 years of age employed therein to justify their exclusion therefrom, and may prohibit their employment therein. " that rules out corporate work?

something else?

thanks.
Added (1). I am referring to kids under 16.i know there are some 16, 17 year olds working at Mcdonalds, etc.

ie.in nevada, they used to give out work permits to kids 14 and 15.now they don't give out work permits anymore.but it was common knowledge that you had to be 16 to work at most places at the mall or mcdonalds.and 14 year olds had to get a job at a family or locally owned business like ma's grocery store or whatever.

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