With physical locks you are exposed to the few people that can walk up to the lock without attracting attention. With digital security, you are potentially exposed to every connected system on the planet. An invisible attacker can't pick your lock, but could hack your security system. That is why digital security is paramount.

Robots are not going door to door picking locks, but that is exactly what happens every second of every day to every system on the Internet. It only takes one, and there are lot of disenfranchised smart people around the globe.