Passing data laravel

$deptID = Pegawai::where('defaultdeptid', Auth::user()->depid)->get();
      foreach($deptID as $item){
            $result = $item->defaultdeptid;
            // dd($result);
      }
      $result;

$iclock = Iclock::where('DeptID', $result)->get();
//array
$test1 = ($iclock[0]->SN);
$test2 = ($iclock[1]->SN);

$transaksi = Checkinout::whereIn('SN', [$test1, $test2])->get();

Ada yang tau cara passing data tersebut di where('SN', argumen...)
jika argumen ketiga/ nilai untuk dievaluasi berupa array seperti diatas