Add encrypt option to iron queue config.

app/config/queue.php

@@ -53,6 +53,7 @@ return array(
 			'project' => 'your-project-id',
 			'token'   => 'your-token',
 			'queue'   => 'your-queue-name',
+			'encrypt' => true,
 		),
 
 		'redis' => array(