Enable/Disable Form Button with password

Hello,

I have 2 buttons on Sheet1 that either protects or unprotects Sheet2 and Sheet3. I would like buttons to be only enabled if correct password ("1234") is entered into B4.

Additionally I would like the passcode to automatically erase once I either leave the sheet or close workbook.

This should be an easy fix but I'm a toddler still learning to walk & talk VBA scripting. Please help....thank you!

Of course if there is a better way to lock objects I would welcome all advice and criticism.