The poem twists a familiar piece of advice, "aim for the moon, even if you miss you'll land among the stars," into something much bleaker. Here, missing the moon means landing a seasonal job at Walmart. The speaker talks like a casual, slightly offhand adult giving tips to a kid, but the cheerfulness is clearly sarcastic. "If you're really good you might get to stay full-time" sets the bar for success painfully low.
In the second stanza, the dream shrinks further into a line of people waiting at a customer service desk, next to a sign about money-wiring rates. The mention of single parents quietly shows who else is stuck there. The speaker seems bitter and tired, but also oddly protective, even slipping in a reminder about the social security number "for heaven's sake." The mood is dry, deflating, and a little sad, as if hope has been replaced by practical paperwork.