A ready CV example for the Retail Cashier / Sales Assistant role. Everything in square brackets is a placeholder: replace it with your own facts, otherwise an ATS reads it as written.
Sales assistant with [N] years of experience in [product category]. I advise customers, run the till and merchandising and meet my personal sales target.
customer service, cash handling, merchandising, POS, sales target, stock control, teamwork, shift work
One page is enough.
Job posts for this role most often contain: customer service, cash handling, merchandising, POS, sales target, stock control, teamwork, shift work. Use them only where they are true for you, spelled as in the job post.
An overlong duties list. For retail 3–4 short bullets with numbers work better.