Key - can be lost or locked in the building (if a nightlatch is used)
Code - the code entry can be observed by a potential person aiming for un-authorised access
Biometric - an electrical fault or mal function on the control panel can occur [regardless of a backup power supply]
If an electrical lock fails, then an overide key is required to gain access, so why not use a key in the first place?
I was thinking from a guests point of view, when no staff or management or on site to let the person in who is locked out, although occurances may be rare.
Code - the code entry can be observed by a potential person aiming for un-authorised access
Biometric - an electrical fault or mal function on the control panel can occur [regardless of a backup power supply]
If an electrical lock fails, then an overide key is required to gain access, so why not use a key in the first place?
I was thinking from a guests point of view, when no staff or management or on site to let the person in who is locked out, although occurances may be rare.