I applied for a position working as a casher, waitress and cleaner in a fast food resturant when I first arrived in Toronto. My boss said the same thing and I accepted at that time. At the end of the second day, I told him, "How do you think my work. I've worked here for 2 days, I think you can figure out if am the right person for this position. If you think I am OK working here, please pay me from tomorrow. If not, sorry, I've got to go. I am busy and I have a lot of things to do. But I do appriciate the opprotunity you provide." He thought for a whild, then tell me yes you can work from tomorrow. Try if you want. But don't waste your time up to one week. Good luck!!!