Laravel not retrieving values from database

I want to retrieve all column values. Following is the dashboard controller code, which runs index method by default

<?php

namespace App\Http\Controllers;

use App\questions;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use App\Http\Requests;

class Dashboard extends Controller
{
    public function __construct()
    {
        $this->middleware('auth');
    }
    public function fetchQuestions() {
        return questions::where('people_id','=',Auth::id())->pluck('question');
    }
    public function index(){
        $listQuestions=$this->fetchQuestions();
        return view('forms.question',compact('listQuestions'));
    }
}

View File

<ul>
@foreach ($listQuestions as $question)
    <li></li>
@endforeach
</ul>

It doesn't show any error or any result either

via Chebli Mohamed