Yes. Generally you just need the hardware to accomplish the talking and a smartapp in SmartThings can be a one push solution. Core is the community rules app that a lot of us use for large scale automations like you are seeking.
Generally, you will want to peruse the Device Integrations section of the forum to find the hardware you need for your task(s), then read up on Core once you are ready to write automations.
The cleanest home entertainment automation will be Logitech’s Harmony Hub which is a wifi IR repeater you control through your phone and cloud-to-cloud throughout ST.
You then get ST talking to your locks, lights, thermostats, and install Ask Alexa.
You can create a Routine in the ST app that sets any number of lights to 10%, locks all zwave locks, lowers any thermostats to whatever temperature, and fires whatever Logitech Harmony scene you’ve set up that corresponds to turning your tv on to play a movie. You then tell Alexa to fire that routine anytime you’re ready for a movie.