Fix for locking

redis_cache/backends/base.py

@@ -510,7 +510,7 @@ class BaseRedisCache(BaseCache):
     def try_delete(self, client, key):
         """Remove a key from the cache if not locked."""
         lock_key = "__lock__" + key
-        lock = cache.lock(lock_key, timeout=5)
+        lock = self.lock(lock_key, timeout=5)
         acquired = lock.acquire(blocking=False)
         if acquired:
             try: