Cashier is an unskilled position, you cannot get PR from that.
Looking through your previous posts, you were caught working illegally and banned from applying for a work permit for 6 months in March. Even if you apply after that 6 month ban is over, your chances of actually getting a work permit are low.
Your posts indicate you are trying to stay permanently in Canada by any means, study, work, spousal sponsorship. Be very careful, as you have already been lucky not to be kicked out and banned from the country when you were caught working illegally.