This is an empirical matter, you don't have to make assumptions on what "would" happen to restaurant owners or unskilled workers if minimum wage wage was increased. Even in the case of Australia, which I noticed was brought up in this thread, minimum wage has failed to produce the results that the left say's it would when under empirical study.
"This research found that increases in the minimum wage in Western Australia were followed by reductions in employment relative to other jurisdictions where corresponding increases in the minimum wage did not occur...As expected, this was most pronounced among young people, where the minimum wage had a large effect on labour demand. The results of this research found a consistent negative relationship between the minimum wage and labour demand (i.e., when the former is increased, the latter decreases)."(source)
In the end, economist have been saying this for decades now and it hasn't stopped the fact-free-left from ignoring it. They care more about feeding their ego with their own social vision and feelings of morality than the hard facts, which only ends up with them hurting the people they claim to be helping -- Ex. BLACK PEOPLE. And then they'll dump the blame on someone else like the rich, the right, racist institutions, or capitalism. It's the same old story.