Take a Peek - New Stealth Mechanic Mod
MODNow you get to know without actually going through the door.
If you use a different framework other than nff/vanilla or you currently have a follower that has their own thing going on, you might want to tell them to wait for you before using the ability.
If you don't like having to use an ability for this, the MCM comes with an alternative activation method: Hold SNEAK button for 2 seconds in front of a door.
