If a competetive, market wage is offered, all kind of college students, high school students, people moving off of Welfare, etc. will take those jobs.
There was an interesting thread a few days ago about fruit growers who are hiring illegals because they're the cheapest labor. When I said the same thing you did above, about six people pointed out that paying higher wages will drive up the price of his crops (which I knew and don't object to), leading the country's wholesalers to start buying cheaper produce from overseas. That hadn't occurred to me.
I'm against tariffs, so what's the solution? Start buying our food overseas? Accept that growing fruits and vegetables is going to disappear from America? I'd be interested to know what you think about this.