Factory Alarm Screwed up

alright so heres the problem, my remote for me 95 s14 doesnt work so everytime i have to use my key. but sometimes i forget to lock the door and i just open the door and the alarm goes off. i didn’t know how to disable it without the remote so i wait it out. well 2 days ago i brought it to nissan and the alarm went off and to my surprise the mechanic disabled the alarm buy locking the door from the outside. now ever since that happend, if i leave the doors unlocked the alarm wont sound and my car wont start. its not a starter problem for sure. its just as if i tried to start the car with the alarm on but now i just dont hear the alarm. is there a procedure to disable it or watever so i can start my car?