Drupal 8: Custom queue worker processed by cron

MyModuleQueueEvent.php

<?php

/**
 * @file
 * Contains \Drupal\my_module\Plugin\QueueWorker\MyModuleQueueEvent.
 */

namespace Drupal\my_module\Plugin\QueueWorker;

use Drupal\Core\Queue\QueueWorkerBase;

/**
 * Queue worker that processes a My Module queue item
 *
 * @QueueWorker(
 * id = "my_module_queue_worker",
 * title = "My Module Queue Worker",
 * cron = {"time" = 10}
 * )
 * ^ "time" is the max execution time of this worker when run by cron
 */
class MyModuleQueueEvent extends QueueWorkerBase {
  /**
   *
   * Processes a single item of Queue.
   *
   * @param mixed $data
   *   The data that was passed to
   *   \Drupal\Core\Queue\QueueInterface::createItem() when the item was queued.
   *
   */
  public function processItem($data) {
    // Logic to process $data.
  }
}