If the area is so high secure that this is a real threat then you should be using nfc tokens and a fingerprint/code scanner. The chance that someone will steal

If the area is so high secure that this is a real threat then you should be using nfc tokens and a fingerprint/code scanner. The chance that someone will steal your token and clone your fingerprint before you notice and deactivate the token is nonexistant. And if all that is still not enough security then you need to combine that with a security guard at the door. Key and lock security is for low security situations where it just has to be more secure than the window.