Daunis’s failure to get Grandpa Lorenzo’s old office furniture open symbolically highlights that Daunis has grown up—she no longer has access to things from her childhood, such as this cabinet. When this failure comes just before Mike concerningly insists he knows what Daunis is doing, it shows how lost Daunis is in her new adult role. She doesn’t yet know how to bring certain things from childhood (whether that be her friendship with Mike or her grandpa’s filing cabinet) into adulthood, and that’s wildly destabilizing. In this situation, if Mike truly does know what Daunis is up to, it could even be dangerous.