PeopleTools 8.56 Is there a way to sign out of PS using PeopleCode?

We are on HCM 9.2 upgrading to tools 8.56, rolling out Fluid UI. My HR folks want a custom tile for logging out to be present on the Employee Self Service Home Page. I tried tracing the sign out action from the Action icon on the fluid header but don't get much information. HR doesnt want Self Service users to be confused and not be able to locate the action icon.

I built a fluid page with a push button and use peoplecode to build the logout URL "https://hrtest.abc.com/psp/hrtest/EMPLOYEE/HRMS/?cmd=logout" and it does logout the user BUT if they click the browser back button, it logs right back into the last PS page the user was on.