My cats are opening doors

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Both my cats are opening doors. They open the kitchen door and this is so bad for us. They steal our food. I don't know what we should do because they learned to open most doors. But we find them on our tables. They are so stubborn. Do your cats do the same thing? Once they stole the beef meat that was on the table. They taught each other to open the doors. Before only one cat opened the door. Now his brother does the same thing.