The term 'Keebler Worker' is a reference to the Keebler Elves, a group of fictional characters featured in the advertising campaigns of the Keebler Company. The Keebler Elves are depicted as small, humanoid creatures who live in a hollow tree and bake cookies and other snacks for the company. They are known for their hard work and dedication to their craft, and have become an iconic part of the Keebler brand.