Can an employer make me stay after work even though I'm clocked out

So every night at my work ( I work at a fast-food restaurant) we get told by our managers 1 by 1 to clock out, however, they make us stay inside the restaurant waiting on the rest of the team to complete and we all leave together which some times this can be between 10-20 mins we have to wait. I'm in Ohio and 17-year-old Child Labor Laws apply to me with no special restrictions. So my question is can my employer keep me even though they told me to clock out for the night.