Yeah, what happens when a photon tries to squeeze through a small hole is a property of its wave function, not the photon itself. You can think of the wave function like an instruction manual that the photon consults whenever it moves. It provides the rules that a photon must obey, and the rules say that a small hole will spread out the possible places the photon can end up. This in turn is due to the importance of constructive and destructive interference of the processes that contribute to the wave function, which get altered by the hole.