Who among the following must be compensated at one and one-half times their regular hourly rate for overtime hours worked?

The requirement for compensation at one and one-half times the regular hourly rate for overtime hours typically applies to non-exempt employees under the Fair Labor Standards Act (FLSA). Among the roles listed, the janitor is often considered a non-exempt employee, meaning they are entitled to overtime pay for hours worked beyond 40 in a workweek.

In contrast, managerial positions, such as a manager, are generally classified as exempt employees and do not require overtime pay due to their supervisory responsibilities and salary level. Similarly, secretarial positions can sometimes fall under the administrative exemption, depending on their job duties and salary level. A sales associate's eligibility for overtime can vary depending on how their compensation is structured, such as if they work on a commission basis and their primary duties.

Thus, the janitor, as a likely non-exempt employee, would be entitled to compensation at one and one-half times their regular hourly rate for any overtime hours worked, making this option the correct choice.