public function setSignInLockDelay(int $signin_lock_delay = 0) : CNabuDataObject
    {
        if ($signin_lock_delay === null) {
            throw new ENabuCoreException(
                    ENabuCoreException::ERROR_NULL_VALUE_NOT_ALLOWED_IN,
                    array("\$signin_lock_delay")
            );
        }
        $this->setValue('nb_site_signin_lock_delay', $signin_lock_delay);
        
        return $this;
    }