Creepy or Overreacting?

Our workplace has a room for mothers to express milk in. it’s nice, small with a chair and little mini fridge. There is one room for this purpose. you book time just like any meeting room. We have a few mothers currently expressing. They all get along. Etc. never issues with them We have over 10 meeting rooms btw. For normal meetings. Sound proof. New.

ONE particular male executive manager keeps using this expressing room. He keeps on trying to enter the room even after it’s locked and the occupier yells “it’s locked” .

I now have an assistant I’ve sent home as she’s crying her eyes out as he continues to shake the door. I want to send him to a deep black hole in outer space. BUT, regretfully… the law prevents me doing this. We have dates/times. HR has advised there is nothing more we can do. Surely not? This is now harassment from my perspective. There has been a blanket communication this room is solely for expressing milk. This man has not approached the staff concerned in any way other than trying to enter the room EACH time a female enters it. apology for the download… im with anger. 🫠

UPDATE: Thank you so much for all your contributions and DM’s ; feeling the love and showed my girls they are not alone. Will post an update soon!