To me, they do not even need to be open for services. Just be open for people to come and pray. I was there from 7:15PM-7:45PM and during that time maybe a dozen people came in and prayed for similar amounts of time as I - some for more and some for less time. People were just coming to pray, to worship. It is sad that more churches are not open for people to take a few minutes, to stop by and reflect. A simple side chapel or space that is quiet with scripture to read, some prayer books, I think it would be of great value to people. A Baptist church near me has a prayer space that is always open. Members have a code to get in the building after hours, but even non-members can call a phone number for access.