jokes aside - yes, if pickers are banned in favor of Americans, then automation will get a boost. But then that means less jobs.
Also, automation will take time - for this season you’ll just have people.
And the people will take time to get good at a repetitive task - look at your average lazy Joe who works a desk job. It’d take months. The picking season is 4 months. If Joe Blow needs 2 months to be as good as Jose Bloze, that means the farmer will need more Joe Blows initially.
Fewer jobs for foreign anchor baby vectors? Perfect!
And again, the labor cost of harvest pickers is a tiny share of the retail price of such foods.