Nothing would happen at all. There is a limit before they take it really seriously; it would change by provinces and territories but at least $5000 CAD, give or take. Even if they caught you right on the spot, you would only get a ticket and be asked to show up in court and pay for a fine. You will not go to jail for this but you would 100% have a record and it would impact your life later on in many ways. And of course you can pay for a lawyer to get rid of the record but it will cost you much much more than what you took from store without paying for it.