code: protected function execute(InputInterface $input, OutputInterface $output): int
      {
          if (file_exists($this->lockFile)) {
              $output->writeln('<comment>The install tool has been locked already.</comment>');
  
              return 1;
          }
  
          $fs = new Filesystem();
          $fs->dumpFile($this->lockFile, 3);
  
          $output->writeln('<info>The install tool has been locked.</info>');
  
          return 0;
      }
docs: {@inheritdoc}