How to record the id of an authorized user?

Question

Laravel

I want to write the id of the authorized user to the table adjacent to the user, but not an object is returned, how to ask the code to work?
here is my method:

public function SalesSave(Request $req) {
        $rules = [
            'date' => 'required|min:4|max:36',
            'earnings' => 'min:1|max:16',
        ];
        $validator = Validator::make($req->all(), $rules);
        if($validator->fails()){
            return response()->json($validator->errors(), 400);
        }
        $us = Auth::user()->id;
        DB::table('sales')->insertGetId(
            ['date' => $req->query('date'), 'id' => $us, 'earnings' => $req->query('earnings')]);
        return view('home',[]);
    }

mistake: