Magento 2 remove un-unsed captcha folder i.e. pub\media\captcha\base folder

magento2_delete_captcha_folder.php

<?php
use Magento\Framework\App\Bootstrap;

require __DIR__ . '/app/bootstrap.php';
ini_set('display_errors', 1);
$host = $_SERVER['HTTP_HOST'];
$params = $_SERVER;
$bootstrap = Bootstrap::create(BP, $params);
$objectManager = $bootstrap->getObjectManager();
$state = $objectManager->get('Magento\Framework\App\State');
$state->setAreaCode('frontend');

$deleteExpiredImages = $objectManager->get('Magento\Captcha\Cron\DeleteExpiredImages');
try{
    $deleteExpiredImages->execute();    
    echo 'deleteExpiredImages, done';
}
catch(Exception $e){
    echo $e->getMessage();
}

CRON TAB: /usr/local/bin/ea-php74 /var/www/public_html/magento2_delete_captcha_folder.php 2>&1 | tee /var/www/public_html/magento2_deleteCaptcha.log