public function logout()
    {
        // Token from Clef.io
        if (isset($_POST['logout_token'])) {
            // Verif token
            $clef = \Aperdia\Clef::logout($_POST['logout_token']);

            if (!$clef) {
                // Verif in Authentication table
                $auth = Authentication::whereprovider("clef")->whereprovider_uid($clef)->first();

                if (!empty($auth)) {
                    $user = User::find($auth->user_id);

                    if (!empty($user)) {
                        $user->logout = 1;
                        $user->save();
                    }
                }
            }
        }
    }