Button To Unlock & Unhide All Columns

I have a sheet that upon opening a macro runs to hide a selection of columns based on cell containing certain words (see here).

I now also require the workbook to be protected so that the hidden columns (which Im sure are locked as default when hidden) are locked as are columns N & S. Now, I know I can do this by protecting the sheet and unprotecting the columns I require (ie N & S - with the hidden cells remaining locked anyway).

The issue is, every time the workbook is opened this protection must be in place.

However, I require a button, which could simply reside in A1, that when pressed, will unhide and unlocked all cells. - This is needed as its vital I can easily copy rows to another sheet (and delete from existing sheet) as and when required.

if possible, re-pressing the button would hide and proetct the worksheet however this is not too significant as long as when I close and open the workbook everything is hidden and protected as specified above.

There is no need to password protect anything.