failedLoginUser example

$hash = $getUser['password'];
            $plaintext = $password;
            $password = $hash;

            $isValidLogin = $this->passwordEncoder->isPasswordValid($plaintext, $hash, $encoderName);
        }

        if ($isValidLogin) {
            $this->loginUser($getUser, $email, $password, $isPreHashed, $encoderName, $plaintext, $hash);
        } else {
            $sErrorMessages = $this->failedLoginUser($addScopeSql, $email, $sErrorMessages, $password);
        }

        [$sErrorMessages, $sErrorFlag] = $this->eventManager->filter(
            'Shopware_Modules_Admin_Login_FilterResult',
            [$sErrorMessages, $sErrorFlag],
            ['subject' => $this, 'email' => $email, 'password' => $password, 'error' => $sErrorMessages]
        );

        return ['sErrorFlag' => $sErrorFlag, 'sErrorMessages' => $sErrorMessages];
    }