First off, this already happens: every major corporation uses multi-party disk encryption, usually branded as "recovery options" or some such. They keep their private keys secure.
Second off, the FBI is not asking for a special door to every apartment. They are asking a lock manufacturer to create a key and use it to unlock a single lock that is brought to them, after the lock manufacturer explicitly designed their locks to make the creation of such a key possible, so that this legal case would exist.
There is an interesting debate to be had here, but this rhetoric using overly simplified analogies is not it.
Second off, the FBI is not asking for a special door to every apartment. They are asking a lock manufacturer to create a key and use it to unlock a single lock that is brought to them, after the lock manufacturer explicitly designed their locks to make the creation of such a key possible, so that this legal case would exist.
There is an interesting debate to be had here, but this rhetoric using overly simplified analogies is not it.