I live in Quebec, occasionally you come across someone in Montreal who works a job and doesn't speak French, so it's definitely possible to work if you don't speak French as long as you speak English.
Brings back memories, it's been 2 years since I've left my hometown of Montreal to move to Japan...I think I saw my workplace a little bit in the distance in this video. And I'm very familiar with that SAQ Express and Second Cup. Quick tip if you're going to go frequently to the SAQ, get the SAQ inspire card and load the app on your phone, every time to buy something, you can collect points when the cashier scan your bar code on the card or phone.