As Mother’s Day approached, Charlene Fletcher, mother of two, found herself occupied with the needs of other families, attending to the crush of shoppers last week at the Walmart in Duarte, Calif., where she works.

On Mother’s Day itself, she would be in the store, making sure shoppers had one last chance to pick up a heart pendant or a personalized mug for mom. For the past four years, Fletcher has had to work every Mother’s Day, along with every New Year’s Eve, and nearly every weekend.

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