Average Salary: $18,970
Expected Lifetime Earnings: $792,000
If you're not in a union, you're looking at around $8 an hour. Maybe more over time. But not much more. Buck the odds and make head cashier, and that rate might go up to $9 an hour. You're in the money.
If you're in a union, however, you might actually be able to survive without having to sell your internal organs to make rent. $15-$20 an hour, give or take—maybe around $35-40k annually. If you're in a "decent" union, you'll get a retirement pension and a few other perks as well.
Handling all that money every day, it can be tempting to try the "one for them, one for me" trick, but we wouldn't advise it. There are people who are paid to keep tabs on stuff like that.