If you want to continue working, your employer will have to submit a Labour Market Opinion (LMO) and this request will have to be approved by Human Resources Canada. As part of submitting the LMO, your employer will have to prove that they advertised the job and were unable to find a Canadian or PR to fill the role. If the LMO is approved, you can then apply for a Closed Work Permit which will allow you to continue working.
Hope this helps.