alt Hacker NewsThe moment you start talking, you're no longer using your 5th amendment rights. And anything that you tell an officer that is not truthful, such as providing the wrong password, can be considered a crime in itself. Even claiming you are innocent can be considered a separate crime if you are not proven innocent later on.
You can decide to apply your 5th amendment right at any time, you just have to be explicit that you’re doing so (Salinas v. Texas). And then you have to stand strong in the face of attempts to get you to continue talking.