south create_table doesn't work

I'm trying to use django-south-0.7.3 API's to create a table, following
this: http://south.aeracode.org/docs/databaseapi.html#accessing-the-api

This is my code:
from south.db import dbs
dbs['lc'].create_table('test', [
('id', models.AutoField(primary_key=True)),
('name', models.CharField(max_length=255)),
])

The problem is that I do not get any error, but in the lc database, no
table appears.
Where is the issue?

Thanks in advance

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