Run Worksheet_SelectionChange when moving away from one specific cell, not all others

I have the following code which I am using to try to update the security of other cells based on values entered. I don't want this to run every time the user moves from one editable field to another elsewhere in the worksheet.
I think I need to use "Intersect" but honestly, I don't know exactly how.

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The code is updating the locked/unlocked status of cell S3 depending on the value selected in cell J3; and if S3 is unlocked, then based on the value chosen for S3, the same lock/unlock setting is being updated for cell S5

There is only one worksheet to this project, so yes Sheet1 is the active sheet.

I tried to insert the code you suggested, but unfortunately that did not work; cell S3 remained locked

My goal is this - I only want this code to run when the user moves from J3 to another cell; and from S3 to another cell. I would prefer that elsewhere in the worksheet when the selected cell is changed that it not run the code every time