code: public void unlock() {
      locked = false;
      forAllObservables(new Consumer<ManagedObservable<?>>() {
        @Override
        public void accept(ManagedObservable<?> managedObservable) {
          managedObservable.unlock();
        }
      });
    }
docs: Unlocks (releases) Observables added to this group to emit new events until they are locked,
  unsubscribed or cancelled.