OnGard
https://www.globalsecurityexperts.com/
https://www.globalsecurityexperts.com/products/security-door-brace.html

Security Door Brace, Real Time Demo of The OnGARD Door Brace
https://youtube.com/watch?v=VShhg9uCjoo
OnGARD OnGUARD Security Door Brace Video Installation Instructions
https://youtube.com/watch?v=gAWELxWtkAM
ONGARD Door Brace vs 40lb police battering ram
https://youtube.com/watch?v=wDD2e3xBgUA

Buddybar
https://www.buddybardoorjammer.com/
Buddy Bar Door Jammer Home and Family Security
https://youtube.com/watch?v=KuxGtAe3rEE

NightLock
https://nightlock.com/

Lockdown 1
https://nightlock.com/door-security-devices/door-barricade/nightlock-lockdown/

Nightlock Lockdown Door Barricade Installation
https://youtube.com/watch?v=M9zGBpJcDQs
Police Officer Testing Nightlock Lockdown Door Barricade for Classroom Doors
https://youtube.com/watch?v=taOFk38iEHM
School Safety for Classroom Doors, Teacher's Barricade Device
https://youtube.com/watch?v=YBIQP6uFp-I