At least in Europe, there is often a slot in which you need to put in the key card the hotel provided (or often any card, because it's just a switch and doesn't check the card), so you don't waste energy, while you're not in the room
Said slot for the card is just at the wall after you open the door. So you usually have power, before you're even really inside, because you just reach in and out the card in place.
It's a bit annoying, but that's pretty much it.

As the room should be empty, when there is no card in the slot, I'm not sure how that makes it worse for shy people though o⁠:⁠-⁠)

Needing to install an app and trusting my phone to be charged and functioning, when I want to enter my room, seems much more stressful for me ;⁠-⁠)