Those aren’t invincible either, and I don’t think they are practical for computer security, since transmitting the keys over the web would be a huge vulnerability.
Oh I’m not referring to one time cypher pads for computers. I remember a spy in one of the Le Carre books using a novel as a key pad to send and receive messages. Using the same system even through computers is very difficult or near impossible to decipher. For example using “Catcher in the Rye” as the one time cipher pad, then changing to Rebecca the next time.