Overtime is quite common in some industries like restaurants. According to federal regulations, employees working overtime (that is, more than 40 hours a week) are eligible for one-half times the minimum wage. That means, an employee making $3 an hour at a waiting job is eligible to make close to $10 an hour when they work overtime (in addition to tipping).
Not surprisingly then, overtime is highly sought after in such industries. At the same time, such jobs can also be highly stressful and employee engagement tends to fall despite the higher wage rates.