Error when trying to use function return in if

I'm using Laravel with the AdminLTE layout

I made this function in the file config/adminlte.php to try to define when the menu appears in the sidebar:

<?php

use Illuminate\Support\Facades\Auth;

function teste()
{
    $personal = User::find(Auth::user()->id);

    if($personal->nivel == 1) return true;
    else return false;
}

if(teste()){
    $painel = 'PAINEL ADMINISTRATIVO';
    $menu =  [
        'text'       => 'Usuários Cadastrados',
        'url'  => 'users',
        'icon' => 'users',
    ];
    $menu2 = [
        'text'       => 'Cadastrar Novo Usuário',
        'url'  => 'users/create',
        'icon' => 'user-plus',
    ];
}else{
    $painel = '';
    $menu = '';
    $menu2 = '';
}

But this is returning this error:

Fatal error: Uncaught ReflectionException: Class view does not exist in D:\wamp64\www\sisFarmacia\vendor\laravel\framework\src\Illuminate\Container\Container.php:752 Stack trace: #0
    D:\wamp64\www\sisFarmacia\vendor\laravel\framework\src\Illuminate\Container\Container.php(752): ReflectionClass->__construct('view') #1 
    D:\wamp64\www\sisFarmacia\vendor\laravel\framework\src\Illuminate\Container\Container.php(631): Illuminate\Container\Container->build('view') #2 
    D:\wamp64\www\sisFarmacia\vendor\laravel\framework\src\Illuminate\Container\Container.php(586): Illuminate\Container\Container->resolve('view', Array) #3
     D:\wamp64\www\sisFarmacia\vendor\laravel\framework\src\Illuminate\Foundation\Application.php(732): Illuminate\Container\Container->make('view', Array) #4 
    D:\wamp64\www\sisFarmacia\vendor\laravel\framework\src\Illuminate\Foundation\helpers.php(110): Illuminate\Foundation\Application->make('view', Array) #5 
    D:\wamp64\www\sisFarmacia\vendor\laravel\framework\src\Illuminate\Foundation\helpers.php(965): app('Illuminate\C in D:\wamp64\www\sisFarmacia\vendor\laravel\framework\src\Illuminate\Container\Container.php on line 752

If you change if(teste()) by if(1) the system runs right by displaying the menu, if(0) and does not display the menu

By the tests I did, I believe the problem is in Auth::user()->id but I do not understand why