The lock at your door is also assumed to effectively control who can open it, but as we know keys can be dupplicated. However, it is not possible to copy it without access to your original key and the necessary effort. This is sufficient for the legislator. It would be different if you hung your key on the outside of the door a priori, like Youtube does.
GP was speaking metaphorically, following your (GGP's) metaphor. For some reason, you abandoned the metaphoric level and misunderstood this to be about real keys and locks.
