Laravel听众不工作，专栏没有更新

Question

我创建了一个侦听器，在创建新用户时更新数据库中的字段。这是我的事。

class NewUser
{
use Dispatchable, InteractsWithSockets, SerializesModels;
public $user;

/**
 * Create a new event instance.
 *
 * @return void
 */
public function __construct(User $user)
{
    $this->user = $user;
}

/**
 * Get the channels the event should broadcast on.
 *
 * @return Channel|array
 */
public function broadcastOn()
{
    return new PrivateChannel('channel-name');
}
}

和我的听众

 public function handle(NewUser $event)
{
    $captainrefid = DB::table('users')->where('referral_id', $event->user->referred_by)->value('referral_id');
    $capdownlnrs = DB::table('users')->where('upliner', $captainrefid)->get();
    if(count($capdownlnrs) > 2){
        return DB::table('users')->where('id', $event->user->id)->update(['upliner' => $captainrefid]);
    }

这是我的活动服务提供商

<?php

namespace App\Providers;

use Illuminate\Support\Facades\Event;
use Illuminate\Foundation\Support\Providers\EventServiceProvider as 
ServiceProvider;

class EventServiceProvider extends ServiceProvider
{ 
/**
 * The event listener mappings for the application.
 *
 * @var array
 */
protected $listen = [
    'App\Events\NewUser' => [
        'App\Listeners\UserPairingAndSpillover',
    ],
];

/**
 * Register any events for your application.
 *
 * @return void
 */
public function boot()
{
    parent::boot();

    //
}
} 

它是在用户模型中注册的。

protected $events = [
    'created' => Events\NewUser::class
];

但它没有给出任何错误。然而，列我们数据库没有更新。任何人都可以帮助我为什么？我不必强制排队。