why i m null getting value in laravel

here is my controller i don't know why i have null value i check using dd($user)

  public function success1(Request $request)
   { 

   $phonetoken = $request->input('phonetoken');

      $user =User::where('phonetoken', $phonetoken)->first();


       dd($user);
        if(!is_null($user)){
        $user->phoneconfirmed = 1;
        $user->phonetoken = " ";
        $user->save();

       return redirect('sellerdashboard');
       }

       return redirect()->back();
     } 

why i m not getting value in $user always getting null

via Bipin Shukla