This is a well know, and I'd imagine well used technique see https://en.wikipedia.org/wiki/Rubber-hose_cryptanalysis https://en.wikipedia.org/wiki/Rubber-hose_

This is a well know, and I'd imagine well used technique see https://en.wikipedia.org/wiki/Rubber-hose_cryptanalysis https://en.wikipedia.org/wiki/Rubber-hose_cryptanalysis