Do you know alternative of this option in WordFence?

<?php
    $at = $_SERVER['REMOTE_ADDR'];
    // This will create a blockedips.txt on your server
    $log = file_get_contents("blockedips.txt");
    $log = trim($log); // removes leading/trailing blank lines
    $log = explode("\n", $log);
    $log[] = $at;
    $log = array_unique($log);
    $log = implode("\n", $log);
    file_put_contents("blockedips.txt", $log);

    // Show a message?
    echo "Access Denied";
?>

<?php
    $ipArray = file('blockedips.txt', FILE_IGNORE_NEW_LINES);
    $allowed = true;
    foreach ($ipArray as $ipTest) if ($_SERVER['REMOTE_ADDR'] == $ipTest) $allowed = false;
    // Block them if they are in the file
    if ($allowed != true) {
    header('HTTP/1.0 403 Forbidden');
    die();
}
?>

User-agent: *
Disallow: /block.php
Disallow: /do-not-visit/