webman 多进程业务锁，并发测试 重复记录？

ab -n 100  -c 10 -p 'post.txt' -T 'application/json' 'http://127.0.0.1:8989/api/pay'

<?php

namespace app\controller;

use yzh52521\WebmanLock\Locker;

class Cash {
    public function changeCash()
    {
        // 查询 Redis 余额
        $balance = Redis 余额;
        $amount = 20;
        $newBalance =  $balance  - $amount;
        if ($newBalance < 0) {
            throw new BadRequestHttpException('余额不足');
        }
        $lock = Locker::lock($key);
        if (!$lock->acquire()) {
            throw new \Exception('操作太频繁');
        }
        try {
            // 插入消费日志
            // 更新Redis 余额信息 $newBalance
        } finally {
            $lock->release();
        }

    }
}