How to close a modal window?

I've found a few tutorials on how to open a modal window using Drupal 8, not so hard:

// Add an AJAX command to open a modal dialog with the form as the content.
    $response->addCommand(new OpenModalDialogCommand('Load Window', $modal_form, ['width' => '800']));

But now how do I programmatically close this window? Or more simply, I would like a "Cancel" button available at the bottom of the modal?

Not sure if this is the best way to do it, but if you make an ajax call to a method that calls the CloseModalDialogCommand() the modal will close.

The route:

#Close the modal form
product.closeProductModal:
  path: '/close-modal-form'
  defaults:
    _controller: '\Drupal\product\Controller\ModalController::closeModalForm'
    _title: 'Close modal'
  requirements:
    _permission: 'access content'
    _role: 'administrator'

And then the controller:

Use Drupal\Core\Ajax\CloseModalDialogCommand;
class ModalController extends ControllerBase {
public function closeModalForm(){
        $command = new CloseModalDialogCommand();
        $response = new AjaxResponse();
        $response->addCommand($command);
        return $response;
    }
}