Tried this on my save, can't duplicate. Probably a mod related.
> Plus I can't lock doors for everyone except employees
You can, but not for _doors_. The current game break all doors.
You need to create a fenced area in front of the main door. (porch, i mean) Create a Gate and lock it.
See https://answers.ea.com/t5/Bug-Reports/NEEDS-INPUT-Locked-Doors-unlock-themselves/td-p/6964633/page/2
And if you have MCCC, flag all your employees "Freeze Career (MCCC Career)".
This game sometimes change your employees to do other task, such as festival's vendor role.
When this happens, your "Manage Employees" section will become empty.
To prevent this, you need to flag them to "freeze career" so they won't leave your business.
This bug existed for a long time and I get used to it by freezing their career to mine.
