Surprisingly, technology like this actually exists. It's a cohesive collaboration between home automation and the Internet of Things.

Stuff like "locking your doors" can be achieved with an RFID or other electronic-based lock with a lockdown setting or such. This stuff isn't really mainstream yet but it certainly is out there. I'm interesting in seeing how it develops over the next decade or so, as well. Check out an article about Home Automation from PC Magazine.

Something that I have seen but haven't had the chance to try out yet are the Ubiquiti InWall Manageable Devices. These devices link into power and act as a basic circuit switch but with a twist: these can be controlled via the network. Devices can be set up on schedules or can be managed over the network. This seems like a more cost-effective and easier-to-implement home automation solution for simple things like lights that are standard and not DMX-based (which you would already be able to control through a DMX controller...).