How is this any different of a scenario than having the bank manager memorize a password? They can still force the bank manager to give up the password by threatening to blow their brains out.
> How is this any different of a scenario than having the bank manager memorize a password?
Because in the other scenario the bank manager can be killed and the murderer can still use the "key" (the bank manager's lifeless face). Dead or alive the bank manager is still that same person.
With a password there's more security for the bank manager. If the robber kills the manager then the robber can't get in.
A second password could delay opening the vault (with a pretty animation), alert cops/security, and even lock the front door from the inside. The bank manager is unlikely to have a second face for doing the same.
Biometric auth needs an "under duress" mechanism to be at all comparable.
Because in the other scenario the bank manager can be killed and the murderer can still use the "key" (the bank manager's lifeless face). Dead or alive the bank manager is still that same person.
With a password there's more security for the bank manager. If the robber kills the manager then the robber can't get in.