getLockKey example

        $keys = array_keys($this->locks);
        $this->cache->deleteItems($keys);
        $this->locks = [];
    }

    /** * Tries to lock the cache for a given Request, without blocking. */
    public function lock(Request $request): bool|string
    {
        $key = $this->getLockKey($request);
        if ($this->cache->hasItem($key)) {
            return $key;
        }

        $item = $this->cache->getItem($key);
        $item->set(true);
        $item->expiresAfter(3);

        $this->cache->save($item);
        $this->locks[$key] = true;