Compress excell using Maatwebsite

I don´t know how to compress a excell file made by Maatwebsite in laravel

  $zipname = 'file.zip';
        $zip = new ZipArchive;
        $zip->open($zipname, ZipArchive::CREATE);
        $zip->addFile(Excel::download(new SheetsExports($page1, $page2),$filename . '.xls'));

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