At first I thought this was a reference to the movie Sneakers (https://www.youtube.com/watch?v=-zVgWpVXb64), but after searching it seems Wells Fargo also does this, https://www.wellsfargo.com/privacy-security/voice-verificati....
Using just ones voice is bad. Using a phrase is better. Using a phrase that is unique and describes its function may set-off alarm bells for some.
I never connected the phrase with Sneakers.