Okay, I'm starting to think
"Swiss" is KEY here.
The Big Bang Theory Season 3, Episode 15
But returning to your KEY conundrum,
you should call a locksmith.
The Big Bang Theory Season 2, Episode 3
Sorry. I used my KEY.
The Big Bang Theory Season 12, Episode 15
Give me back my KEY.
The Big Bang Theory Season 1, Episode 2
Computer:
Encryption KEY activated.
Westworld Season 2, Episode 10