Custom Role

I have created a custom role using this plugin called ‘guest’.

I’m running a function to update my role if conditions are met, but it is not working. What additional do I need to do for my role which was created within the plugin? Thanks

// Function to check and update user role based on End Date
function update_user_role_based_on_end_date_cron() {
$users = get_users(array('meta_key' => 'end_date', 'meta_compare' => '<=', 'meta_value' => date('Y-m-d')));

foreach ($users as $user) {
    // Check if the End Date is in the past
    $end_date = get_user_meta($user->ID, 'end_date', true);
    if ($end_date && strtotime($end_date) < time()) {
        // Log a message to the error log
        error_log("Updating role to Guest for user ID: {$user->ID}");

        // Update user role to Guest
        $user_object = new WP_User($user->ID);
        $user_object->set_role('guest');
    }
}

}

// Schedule the cron event every 5 minutes
function schedule_update_user_role_cron() {
if (!wp_next_scheduled('update_user_role_event')) {
wp_schedule_event(time(), 'every_five_minutes', 'update_user_role_event');
}
}
add_action('wp', 'schedule_update_user_role_cron');

// Hook the cron event to run the function
add_action('update_user_role_event', 'update_user_role_based_on_end_date_cron');