Jury time is paid time off at my US company. And at least at the US Federal level there's a daily stipend for sitting on one. Lower level courts may vary on that.
Juries are unpaid and obscure. I think most people in the UK would be delighted to sit in Parliament for the a £100k an year salary + expenses (what MP's currently get) plus a lot of prestige and the experience. It would be a pretty good thing to have on your CV!