Find the queue by name:
> queue = Sidekiq::Queue.all.detect { |queue| queue.name == 'compliance_requests' }
=> #<Sidekiq::Queue:0x00007fa5c4069778 @name="compliance_requests", @rname="queue:compliance_requests">
Clear the queue:
> queue.clear
=> [0, true]
> queue.clear
=> [0, false]