For the translation of this verse into Maasina Fulfulde Doug Higby tells this story:
“[We] had the word for ‘door’ and also a word for knocking or ‘hitting’ a door. But as I thought about it, Jesus was coming to visit! The Fulani don’t even have doors on their traditional huts, and they certainly don’t bang on the reed coverings used to keep the dust out of the doorway. If Jesus came, he would go to the entrance of the courtyard and say, ‘Salaam Alaikum.’ This would announce his presence in the same way that knocking on a door would in Western contexts. But I was concerned… the Greek text says ‘door’ and I wanted to be faithful to the original. Yet, I felt the Fulani customary greeting was exactly what Jesus would do in this context, so I continued. To my great surprise, the next part of the verse went: ‘Anyone who hears my voice and opens the door…’ Voice?! Who said anything about Jesus speaking, I thought he was knocking… So now the Fulani greeting makes even more sense with the cultural version which goes like this: ‘I stand at the entrance (to your courtyard) and greet (in peace). Whoever hears me voice and lets me in, I will enter and eat together with him.’ (Hettina, miɗo nii darii e damal miɗo salmina. Neɗɗo fuu nanɗo daande am so udditi, mi naatan galle mum, mi ɲaamda e mum.).”
See also knock (on door).