A mechanic
A person who works in a coffee shop is often called a 'barista'.
A person who works in making maps is called a cartographer. Cartographers specialize in creating and designing maps that accurately convey geographic information.
A person who works in a garden is called a gardener.
She works in a flower shop
deli clerks are people who make sandwiches and work at super markets.
A person who works with wood is often simply called a woodworker. Depending on the type of work they do, they may be a carpenter, woodcarver, or cabinetmaker.
A volunteer is a person who performs a service without being paid.
A coffee shop...?
A call center operator is a person who works for an answering service. You answer calls for doctors and dentists and the like after hours. They usually are open 24/7 so you work shift work.
Yes it is the third person singular form of work. It is used with he/she/it or a singular noun subject. egHe works at the bookshop.The man next door works at the books shop. -- man is a singular noun.Works can also be a noun.
An example of intermittent production would be when a person works making custom settings for engagement rings. He or she does the work as customers come in the shop and request it. It is not work that is done on a continuous basis.
Well, I have a mate who is 14, and she works in a chip shop, but I don't know if you can be any younger.