There is a way to reset Keychain database which will reset keychain password. Follow the steps below to reset the Keychain database (this will delete eveything from keychain and reset its password)
Open Keychain Access, which is in the Utilities folder within the Applications folder.
From the Keychain Access menu, choose Preferences.
Click General, then click Reset My Default Keychain.
Authenticate with your account admin password.
Quit Keychain Access.
If that didn't work, then in Finder, click on Go menu in the top bar and select "Go To folder". Type the following command press return
From the resulting window, move the Keychain folder to desktop. Then open Preferences folder and delete this file "com.apple.keychainaccess.plist"
Open Keychain and your admin password ***** work as keychain password. If that didn't work, then please tell me the version of OS X you are using, so we can reset the admin password ***** then fix Keychain.