다른 사용자가 편집하지 못하도록 docx 파일을 어떻게 잠그습니까?

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namespace App\Controllers\Services
use App\Controllers\BaseController;
use Illuminate\Support\Facades\Response;

use PhpOffice\PhpWord\TemplateProcessor;
use PhpOffice\PhpWord\PhpWord;

class Contract extends BaseController
{
    public function getContract()
    {
        $file = storage_path()."/contracts/contract.docx";
        $tmpFile = storage_path()."/contracts/output.docx";

        $template = new TemplateProcessor($file);
        $template->setValue('COMP_NAME',"LOREM IPSUM INC");
        $template->setValue('ADDRESS',"Nowhere Str Tsastikistan");
        $template->saveAs($tmpFile);

        return Response::make("OK");