Should mandatory (or voluntary) prayer be permitted in public schools?

I think prayers can be permitted in public schools. Because I know that some people would like to have their child in a school that have prayers everyday or whatever amount of days the school participate in the prayer. But also you will have parents who don’t want their child to participate in the school prayer due to their own personal beliefs. Then it should at least be voluntary in public schools. So parents won’t have to feel pressure by the school.