Is it illegal for the community owners to pry the door into the house for decoration after going through the relevant formalities and paying the house levy fee in the future? How to deal with it?

The house is the owner's when it is closed. It is illegal to enter by force.

Some people don't understand and think that the house is their own after spending money. You can understand it this way. You bought a TV in the shopping mall. Can you just pry open the warehouse in the mall and move this TV after paying the money? Commercial housing, like TV, is a commodity, and it also needs to be handed over. The house is not yours until the formalities are completed.