When I was a child I visited the Ford Motor Dearborn Plant - which was then producing 1966 Mustangs. It was a very busy scene, somewhat like an ant farm of activity, hundreds of laborers were within my field of view. The number of hours of labor in a car were probably in the mid teens at that time. Today the number of hours of labor in an assembled auto are probably 2-3. Lots of automation, very few humans visible an an assembly facility today.
Raise the minimum wage to $15 and you probably raise the cost of the lowest skilled entry level employee to about $22 an hour.
Expect to see the classic substitution of capital for labor.