Toolive65

My 92 Lexus LS400 alarm goes off when ever I unlock my door (Drv or Psg) side. I have a regular key, no remote. When ever I unlock the door, the alarm will go off most of the time (8 out of 10). I have to continuously turn the key unlocking, locking, unlocking, locking the door repeatedly before the alarm will stop. I very rarely lock my door because I'm not sure when the alarm will go off when I attempt to unlock it again. If there is a fix for this it would be greatly appreciated if you could share thank you.