What belongs in your text
Add two to four short points for each job. Explain your work, not only your title. For grocery retail worker, this matters when you check goods and stock shelves. Write what you did, where it happened and why the work was useful.
A good example is a short account of how you check dates and assist customers. It shows real work rather than an empty claim. If you have not done that task, choose a different example from your own work.