Shrek…
Just tell the front desk person ‘I am a Sabbath observer and so I’m not allowed, for religious reasons, to use the electronic door locks. but I need to get into my room’.
Usually you need not say any more than that. Unless the person is a total idiot they’ll say to you “No problem, I’ll send someone to open your door for you.”
In this way you have not even directly asked anyone to do it for you, and what you DID say wasn’t even said to the person who actually opened the door.