Locked Units?

Staff members was recently assaulted after family members forced their way into our “locked” unit. The doors aren’t truly secure, people can push past them, and the buzzer system leaves them open long enough for unauthorized entry. We have panic buttons, but there’s a delay in response. This has happened multiple times, and management hasn’t offered much support.
For those who work on locked units, how does your security system work? Magnetically locked doors? Immediate security response? Looking for ideas because staff safety feels like an afterthought.