How to clear blocked queue or forced-to retry blocked queue in AEM through JMX console

Statement - How to clear and force retry blocked queue
Environment - AEM 6.3 GA

Solution:
Go to the Felix console URL: http://localhost:4502/system/console/jmx
Search for publish agent as shown in below screenshot

Open the Publish agent and you can validate whether the queue is blocked or not, If the queue is blocked, you can see the no of items blocked in the queue as per the screenshot.

you can see there are 4 items blocked in the queue, Click on the queueCLear() method --> Click on Invoke to clear the blocked queue and refresh the console post click on invoke as shown in below screenshot.

That's it!