Assuming that this is the only duty involved (or other duties are of a similar unskilled nature), then yes, the requirement to have a high school degree quite possibly would give rise to a discrimination complaint since (unfortunately) such a requirement would serve to rule out a higher number of African Americans and perhaps other minorities than it would Caucasions.
That would have to be statistically demonstrated though. It's possible that a proportionate number of blacks, whites, hispanics, etc. in a given geographic area don't have high school degrees.
That would have to be statistically demonstrated though. It's possible that a proportionate number of blacks, whites, hispanics, etc. in a given geographic area don't have high school degrees.