Connecting to MongoDB with Lumen Framework

Hello, I am running Lumen in Homestead and MongoDB on my local machine and wondering how do I connect to MongoDb on my local machine. I get an error saying

Class 'MongoDB\Driver\Manager' not found

I am using jenssegers/laravel-mongodb and I also have the php mongo driver installed. Running PHP7.0, Here is my files:

userModel.php

<?php namespace App;
use Jenssegers\Mongodb\Eloquent\Model as Eloquent;
class userModel extends Eloquent {
protected $connection = 'mongodb';
protected $collection = 'DATABASE_USERS';
protected $primaryKey = '_id';
}
?>

UsersController.php

<?php
namespace App\Http\Controllers;
use App\userModel;
class UsersController extends Controller
{
/**
* Create a new controller instance.
*
* @return void
*/
public function __construct()
{
}
public function index() {
return userModel::all();
}
}

database.php

<?php
return  [
'default' => 'mongodb',
'connections' => [
'mysql' => [
'driver'    => 'mysql',
'host'      => env('DB_HOST', 'localhost'),
'database'  => env('DB_DATABASE', ''),
'username'  => env('DB_USERNAME', ''),
'password'  => env('DB_PASSWORD', ''),
'charset'   => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix'    => '',
'strict'    => false,
],

            'mongodb' => array(
                    'driver'   => 'mongodb',
                    'host'     => env('MONGODB_HOST', 'localhost'),
                'port'     => env('MONGODB_PORT', 27017),
                    'username' => env('MONGODB_USERNAME', ''),
                'password' => env('MONGODB_PASSWORD', ''),
                    'database' => env('MONGODB_DATABASE', 'DATABASE_USERS'),
                    'options' => array(
                    'db' => env('MONGODB_AUTHDATABASE', '') 
                    )
            ),
    ],
];

?>

I also have the settings that is required in bootstrap/app.php and calling the index() function in routes.