I am facing the issue with google signed URL expiry time. I want to signed URL expire in 5 seconds but its not expiring. here is my python code:

from datetime import datetime,timezone

                expiration_time = datetime.now(timezone.utc) + timedelta(seconds=5)
                

                bucket = client.get_bucket(settings.GS_BUCKET_NAME)
                blob = bucket.blob(object_name)
                signed_url = blob.generate_signed_url(expiration=expiration_time)

Even I have tried with this code as well getting same issue

storage_client = storage.Client()
    bucket = storage_client.bucket(bucket_name)
    blob = bucket.blob(blob_name)

    url = blob.generate_signed_url(
        version="v4",
        # This URL is valid for 15 minutes
        expiration=datetime.timedelta(seconds=5),
        # Allow GET requests using this URL.
        method="GET",
    )

    print("Generated GET signed URL:")
    print(url)
    print("You can use this URL with any user agent, for example:")
    print(f"curl '{url}'")
    return url

Thanks in advance