I hate to tell you but you just flunked Econ 101. Its like this, when wages rise in one segment, they rise in all segments.
Maybe I can explain it better to someone with your educational level. If you give the lettuce pickers $10 more, you have to give the equipment operator, truck driver, and foreman the same, or better, raise. Then everyone in the office has to have a raise.
But wait, there is more.
To fill these jobs, at 10 more, workers will leave other jobs, Those employers will have to raise their wages 10 to retain their employees.
Everyone gets a $10 raise.
O HORROR! We are so lucky to have Mexico next door. Can you imagine the disaster if American workers were paid more?