My password to access the company file in QB24 desktop iMac stopped working.

I can open the QB24 application, but the password won't open the company file.

I verified PW in my Apple Keychain to ensure I was using the right one. 

I have used this password for quite some time, did it get corrupted somehow?

I dont know how to reset it because it wants the password in order to change it.

Can some advise what I should do?