Design a non-computerized biometric door

Nowdays we have biometric doors that can scan your eye, palm, fingerprint, ear, etc, etc...

But all of them rely on electronic readers and computers to match the sample against the stored pattern.

How would you design a biometric door that does not need to rely on a electronic scanner and computer, and could only be opened by the designated person (or someone very alike).

Of course these biometric locks would be easier to pick and less accurate. That is not the concern. They could use electricity or any modern device, just not an electronic reader and/or a microprocessor device.

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Design a non-computerized biometric door

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