protected function lock() { $identityStatus = $this->store->checkIdentityKey($this->authenticationKey); if ($identityStatus !== SqrlStoreInterface::IDENTITY_UNKNOWN) { $this->store->lockIdentityKey($this->authenticationKey); $this->store->endSession($this->requestNut); $this->tif |= self::ID_MATCH | self::SQRL_DISABLED; } else { $this->tif |= self::COMMAND_FAILED | self::CLIENT_FAILURE; } }