Most of Starbuck's cost doesn't come from paying baristas. It comes from coffee, real estate, utilities, and corporate.

Here's some real world evidence:

https://www.washington.edu/news/2016/04/18/early-analysis-of...

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5615576/

https://en.wikipedia.org/wiki/Minimum_wage#Empirical_studies