One person barricaded in a room has the tactical advantage even when facing a team of trained shooters. It's because being in a school type building most rooms have only one entrance and that CQB team each have to cross that threshold which we call the fatal funnel. If you are barricaded in a room with cover you can just set your sites on the doorway and blast anyone who comes through. Even if they don't get killed they will become combat ineffective and yet another casualty. CQB operations have an 83% casualty rate which makes it easily one of the most dangerous operations you can conduct. That is why you have to have coordinated fire and in this scenario you would likely have to have a designated marksman trying to cover the team through the windows of the room as they make entrance or you have to blow a hole in a wall of a conjoined room to gain another angle of attack that the person then has to engage. When doing our final training scenario for CQB school we did force on force operations in a school and with two instructors barricaded in a room they were able to take out all 12 of us who tried to make entry. We never even got two feet into the room. When you have kids possibly in the room as well it removes options like breaching walls and your DM has to be able to have eyes on the target to try and get an angle that the team can't get. Anyone who has learned CQB or been through the course will tell you that it takes an entirely different level of understanding than what you initially believe.
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