Revelation 3:20 is a well-known verse:
Behold, I stand at the door and knock. If anyone hears my voice and opens the door, I will come in to him and eat with him, and he with me. (Revelation 3:20 ESV)
In spite of the many artistic and evangelistic portrayals of this verse, the context establishes that Jesus is actually knocking at the door of his church, not at the door of individuals. Doug Wilson comments on this, saying that “This is, in the first instance, the door of the church at Laodicea, and then by extension, any church that has people who have drifted into a lukewarm approach to Jesus.”
From elsewhere in Revelation we can establish that a worship service contains prophetic preaching (trumpets) and singing. But those are not present in this verse. Instead, Jesus’s highest intention in meeting with his people is to share a meal with them.
Thus, weekly communion: why open the door but refuse the meal?