Pretty soon, some areas of the Church will be entering the winter indoor sickness season. Pastors and the occasional bishop will place restrictions here and there on receiving Communion or touching people at the exchange of peace. More rare will be guidelines on touching parts of doors–where a lot of germs dwell.
I have yet to hear of a directive instructing ushers or greeters or hospitality ministers to open doors for worshipers. But in light of other restrictions, it would make as much sense.