Rights being human-made doesn’t reduce them to brainwashing or force.
Money, laws and contracts are human-made too, yet they still work because people can reason, cooperate and build institutions around shared rules.
“Not a magic object in nature” is a very strange test for whether something matters.
Rights are artefacts of the mind, and the only way to make someone accept the idea of rights is by brainwashing them from birth, controlling incentives related to survival, or force.
After all, there is no magic rock we call a “Right”. Unless it caved someone’s skull in.