Are there any effective alternatives to bark collars?

Our dogs have barked nonstop the past few days... Not sure what to do to get them to stop. We verbal correct them, redirect, and that stops them for a moment.

They had bark collars but one dog still refused to stop barking and we felt like she was getting shocked too much. She just never made the connection that oh I'm barking and then I get zapped or just didn't care.