if its no longer cranking, nor is the horn working the battery died locking the key to on. jumper cables to your battery will let the key turn back.

or you have a plug under the wheel, pop th eplug out and push inside with a pen, stick, a straw, what ever you got, this is the key release.

the abs issue, get the car scanned at a shop for abs codes. could be a bad ebcm.