What is the situational irony in the poem A Red Palm by Gary Soto?

The situational irony in "A Red Palm" by Gary Soto lies in the fact that the speaker, who is a worker in the fields picking grapes, desires a full grape bunch as a reward for his hard work but only receives a single palm leaf instead. This outcome is unexpected and contrasts with the speaker's initial expectations, highlighting the disparity between his labor and the meager reward he receives.