Disclaimer the Door Models are made by the game I use to Develop for and are used everywhere, however I made the centralised door system.

The centralised door system makes the doors all run smoothly using run service and is all Centralised into one Script cutting down heavily on server memory that conventional door systems usually do.

It contains a Site Lockdown System that works as follows:
Tier Zero  (T0) is your access with the site running normally.
Tier One   (T1) is for only combative cards and above mainly for Riots and Breaches.
Tier Two   (T2) is for a Internal Security Threat and is for Redacted 
Tier Three (T3) is for OMNI only access to the area.
Tier Four   (T4) is No access to that area.

The Locking System is more detailed that just locking the Entire site, It can Lock a Room, Sector or just the Entire Site.
For more events there is also a Door Lock Fail System that can be enabled with a Global Function to Open all doors in the site at once.

A full read me file has been included explaining the system the best I could (Found in ServerScriptService), but feel free to contact me for help.

Videos:
Doors Opening (https://streamable.com/n1bv1s)
Door Erroring System (https://streamable.com/kbf6ir)
Door Locking System (https://streamable.com/nnpesh)