class Sidekiq::BasicFetch

def retrieve_work
  qs = queues_cmd
  # 4825 Sidekiq Pro with all queues paused will return an
  # empty set of queues
  if qs.size <= 0
    sleep(TIMEOUT)
    return nil
  end
  queue, job = redis { |conn| conn.blocking_call(TIMEOUT, "brpop", *qs, TIMEOUT) }
  UnitOfWork.new(queue, job, config) if queue
end