It is very secure against people who aren't members of Congress. If you tried to walk in there, you'd find yourself in a cell.It apparently is not a secure area at all if a congressman and 29 of his buddies went busting thru the door with cell phones for a lib style sit in lol.
Trump loves this stuff it’s just season 15 of The Apprentice to him. He beat ALL of the Washington Elite by doing the impossible (the coward McCain and Romney both hated his guts for doing in a year what they tried a lifetime to do)and getting elected and when he is found not guilty in the Senate it’s game set match and on for Season 2!!!!!!
The Rs know that the Ds didn't want the spectacle of arresting a bunch of them for running in there, so they got away with the stunt. This is where leadership on the minority party side needs to take control and impose some order so this sort of nonsense is avoided.