Airport extreme help

It's important that when you include devices that shouldn't have access, that you don't forget to exclude devices that you do want access.

See if any of the following additional articles can help:

• Use Timed Access Control to restrict when devices can connect to your Apple base station Wi-Fi - Macworld
• How-to: Set time limits on your Wi-Fi network using AirPort Utility - 9TO5Mac

Instead of remotely accessing it have you considered enabling timed access? With this feature you can basically disable wireless access for certain periods of time.

Ref: How to set up Timed Access Control on your Apple AirPort router - iMore

If remote access is still what you prefer, what will you be using to access the base station from work with ... a Mac or PC? Apple used to make this easy from a Mac device with Back to My Mac (BtMM), but they disabled this feature with macOS Mojave ... and, in that case, you would need to rely on either port mapping or using a VPN to access it from a remote location.