The keytool that ships with the Oracle JDK allows you to specify it on the command line with -storepass, you were doing keytool -help instead of keytool -list -help. (I suppose the Android version is the same.)
C:\>keytool.exe -list -help
keytool -list [OPTION]...
Lists entries in a keystore
Options:
-rfc output in RFC style
-alias <alias> alias name of the entry to process
-keystore <keystore> keystore name
-storepass <arg> keystore password
-storetype <storetype> keystore type
-providername <providername> provider name
-providerclass <providerclass> provider class name
-providerarg <arg> provider argument
-providerpath <pathlist> provider classpath
-v verbose output
-protected password through protected mechanism
Use "keytool -help" for all available commands