If you mean "hydro lock", that is when coolant enters the combustion chamber and prevents the engine from turning (water doesn't compress)
turning key in the door lock should disengage the alarm
It should bleed its self when turning lock to lock while engine is running.
Not sure what your doing but you can use a strap wrench around the bottom pulley to hold the crank from turning.
The key and the ignition lock are badly worn. Try a different key if it doesn't fix it you need to replace the ignition lock.
you look if the owner out a lock on the engine
Auto door locks is a safety feature designed among other things to help you not get car jacked, it is tied into the security system so removing the security system fuse will disable it but will also disable the remote door lock feature.
Either with specialized tools available to locksmiths or by dismantling the lock and removing the obstruction.
pull the fuse
When the engine can no longer rotate.