Generally, an employer can require employees to work more than 40 hours in a workweek, and can even discipline or fire employees for refusing work over 40 hours. The FLSA does not establish the number of hours that an employer can require employees to work in a given week or day. Instead, the FLSA only requires the employer to provide overtime pay for hours worked beyond 40 hours in a workweek.
Please note that under Florida law, there is a separate statute that entitles an employee to overtime if the employee is paid on a daily rate and the employee works over 10 hours in a work day (and is not otherwise exempt from overtime). In other words, if the employee, is paid a specific amount per day, and the employee works more than ten (10) hours in a work day, then the employee is entitled to overtime for all hours that they work over ten (10) hours in a work day.