How to unlatch relay with relay?
What im doing wrong?


You are not interrupting the power feed to RLY1 - once the doors are unlocked RL1 turns on and no matter what the lock contact does RLY1 will stay on. 

Try putting the door unlock contact in series with the NC contact of RL2 and rewiring the power feeds. Alternatively look at this stop/start circuit for ideas: -



The stop circuit contact is the normally closed contact of RLY2