Door Security Lock, Child Proof Door Reinforcement Lock with 2" Stop 4Screws for Inward Swinging Door, Double Safety Security Protection for Your Home（2PACK） https://www.amazon.com/dp/B07KZ6DFKR/ref=cm_sw_r_cp_api_i_V1F0Z0TG4GASP97GCAV3?_encoding=UTF8&psc=1

I just installed these so my son can’t open the door by himself.

they they were super easy to install and very sturdy. about three per door for a door even the cops can’t ram in!

I only used one and i don’t think i could kick the door in anymore