Locks the Logon plugin's secure data vault.
<static> lock( onsuccess, onerror )
| Name | Type | Description | 
| onsuccess | sap.Logon~successCallbackNoParameters | The function to invoke upon success. | 
| onerror | sap.Logon~errorCallback | The function to invoke in case of error. | 
var errorCallback = function(errorInfo){
    alert("Error: " + JSON.stringify(errorInfo));
}
var successCallback = function(){
    alert("Locked!");
}
sap.Logon.lock(successCallback,errorCallback);