Do minimum wage laws help low-skilled workers? No. Workers are thrown out of work if they cannot produce more than the minimum wage stipulates. If the minimum wage is $15/hour and a worker can only produce $13/hour worth of goods, they will not be hired since no profit-seeking employer would employ someone at a loss.
Early proponents of the minimum wage advocated it not in spite of, but for its deleterious effects on minority populations.
U.S. policymakers cannot base their estimates of how refugees will impact the labor market on the situation in Germany. Labor market institutions in the United States are better equipped to handle an influx of new workers.