The federal minimum wage hasn't budged in 14 years. It's closer to the United Nations definitions of poverty than it is to resembling a wage.
$15 is under minimum wage in many parts of the US
Is McDonalds paying the minimum wage anywhere in the US?
Maybe in a very rural area, but I'd be surprised to see a McD there to begin with. Do you have a source? I'm genuinely interested in looking at this more for unrelated reasons.