In Quebec, the courts operate primarily in French, so the presumption is that jurors need to speak French.
An anglophone has a right to a trial in English (just like a francophone has a right to a trial in French in other provinces), but only if they ask for it.
The courts in a big centre like Montreal are more adaptive to either language, but in the smaller centres that are primarily francophone, French is the normal working language of the courts.
I was only summoned once, back in the 80s. I was asked what I did for a living, replied that I was a Federal civil servant, and the defence lawyer challenged. Got a day off with pay out of it*, but had looked forward to the experience.
(*Paid jury leave. The government wants their employees to do their civic duty!)
I got a notice a few years ago. Lawyers here can’t serve on a jury, so I just phoned up the sheriff and told him. He chuckled and said he would take me off the pool.