Since you were not on the lease, they absolutely had a right to kick you out. However, this doesn't give them a right to hold your property. Tell them you're going to call the cops if they don't let you get your stuff back. If they won't listen, call the police.
I moved out of an apartment at the end of March. Under California law, the landlord had until April 17 (21 days) to return my security deposit. The landlord did not return the deposit. I sent an email, and got no reply. I visited the rental office, and found out that a partial return fo the...