Job with ShouldBeUnique never dispatched

I'm trying to dispatch a job which implements shouldBeUnique but it doesn't work, my job is never in the queue. If I remove ShouldBeUnique, it works as expected.

I am using Redis.

Do you guys have an idea what's happening?

Here is my code :

<?php

namespace App\Jobs;

use Exception;
use Throwable;
use App\Models\User;
use Illuminate\Bus\Queueable;
use Illuminate\Queue\SerializesModels;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Contracts\Queue\ShouldBeUnique;
use Illuminate\Foundation\Bus\Dispatchable;

class VerifyJob implements ShouldQueue, ShouldBeUnique
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    public $releaseDelay = 10;
    public $tries = 3;

    public $user;

    public function __construct(User $user)
    {
        $this->user = $user;
    }

    public function uniqueId()
    {
        return $this->user->id;
    }

    public function handle()
    {
        \Log::debug('verify 0');

        return;
    }

    public function failed(Throwable $exception)
    {
        \Log::debug('verify 999');
    }
}