Worker is a compound sign: first, sign work, then sign the agent marker. Work is signed by closing both hands into fists in front of you, then tapping your dominant fist on top of your non-dominant fist a couple of times at the wrist area.
Finish off by signing the person or agent marker, holding both flat, open hands in front of your body with palms facing each other, then sliding both parallel hands downward.
Teach your advanced toddler the worker sign in real-life situations, when they see Mom or Dad - or any other person - hard at work at home, in the yard, or in their place of profession. As you introduce your child to different types of white- and blue-collar workers as well as their respective jobs, your little one can begin to understand the concept of doing something - and hopefully, doing it well and enjoying it at the same time.
This is a useful flash card taught best in conjunction with specific adult professionals and blue-collar workers that your child can observe in the neighborhood.