as a staff iin a nice way to say you want to wotk there
      Answer1:If you are hiring, I would like to apply...thats good :)
      Answer2:- "are you hiring?"- "i am very fascinated by the work you do here."- "i am interested in working for you"- "do you need any more help around the store?"- "are you interested in hiring? i would love to work here"- show that you know the background to their store, and that youve done research- show that you have background in retail, etc.
      Answer3:Ask if there hiring and tell them that your interested and you like there company.And just simply apply