But you can bring them in by offering the market-clearing wage. Or if you're a globalist Free Traitor you can screw them over with foreign labor.
That’s the thing about seasonal labor - it’s seasonal - and requires travel to extend it - how many friends/acquaintances you got that would be willing to do that vs. a regular job?
Raising wages/benefits for part time labor would also raise the cost of food - and get a whole new set of folks whining.