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Unlink function not works in laravel after creating a zip file

I m using a package called zipper in laravel to create zip files. Files are stored in a folder and filenames in the db table. after creating zip files , the remaining files i have to delete from the folder.But while using the below code unlink/File::delete() was not working. code looks like as below

 $zipFileClass = new Zipper();
            $getDate = date("Ymd");
            $getTime = time();
            $newFileName =  'mynewfile_' . $getDate . '_' . $getTime . '.zip';
            $zipFileClass->make($save_file_path. '/' . $newFileName)->add($FilenameDetails);
           
            }
             foreach ($FilenameDetailsas $key => $val) {
                  
                if(file_exists($save_file_path.'/'.$val))
                {
                   unlink($file_path.'/'.$val);
                 
                }
            }

$zipFileClass = new Zipper();

$getDate = date("Ymd");

$getTime = time();

$newFileName = 'mynewfile_' . $getDate . '_' . $getTime . '.zip';

$zipFileClass->make($save_file_path. '/' . $newFileName)->add($FilenameDetails);

}

foreach ($FilenameDetailsas $key => $val) {

if(file_exists($save_file_path.'/'.$val))

{

unlink($file_path.'/'.$val);

}