public function process_import(Request $request)
    {
        ini_set('memory_limit', '-1');
        ini_set('max_execution_time', 300);
        set_time_limit(300);

        $request->validate([
            'file' => 'required|mimes:xls,xlsx',
        ]);

        try{
            Excel::import(new UserImport, request()->file('file'));
            return redirect()->back()->with('success', 'User has been import successfully!');
        } catch( \Illuminate\Database\QueryException $e){
            return redirect()->back()->with('error', 'Import Data Failed or Duplicate!');
        }
    }