Once those professionals and people more at risk are done I'd offer it to essential workers (like supermarket, groceries personel, pharmacy personnel, post and courier personnel, government offices, cleaners of hospitals and all those places if not done before for some reason, etc. then I'd go for non-essential but public facing workers: shop assistants, waiters, receptionists, bank staff, hairdressers, tatooers, actors, sex workers, etc. and finally office workers, executives, and then unemployed and teleworkers). But that's of course difficult and requires ignoring that nobody has any stable job anymore, so it's more easily replaced by just decreasing age groups.