The original lawsuit, which was filed in May 2009 in California Superior Court, alleged that the Washington-based membership warehouse chain locked its employees in the store at the end of their shift until managers finished specific duties, such as emptying cash registers.
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The plaintiffs added that the lock-in periods typically lasted between 10 and 30 minutes.
"Costco managers do a lot of administrative duties at the end of the day," said an attorney for the plaintiffs. "The rationale for locking the workers in while the managers finish up administrative duties is to secure the building and keep people safe. That is a fine justification, but if you do it, you have to pay the workers."
According to the California Department of Industrial Relations, any employment beyond eight hours in a workday requires that the employee is compensated for overtime.