Here is the description of the trap. I removed module specific details to avoid spoilers.
The stone walls of this corridor are carved to resemble a stack of bamboo-like logs. The passage slopes down from a single door on its western leg, the lintel of which has been crafted to represent a stylized cavern entrance.
If the trap triggers, several of the logs swing out from either wall and buffet the party. Once they swing out, the stone logs don’t swing back and thus effectively block the passage, since they bar the way from ceiling to floor with only a 6-inch gap remaining between the logs.
I don’t want it to be impenetrable. How would you rule PCs breaking through?