2005 Hyundai Tiburon 6 cyl Automatic 65,000 miles

i was in the passenger side of my car when i noticed the switch to lock the door just wiggles around and doesnt actually click locked. so i press the lock button inside my car and it doesnt lock, and when i press it on the remote it doesnt lock. or unlock for that matter.
the only way i can lock and unlock my door is if i use the key. is there any easy way to fix this? or is it going to be a high expense? thanks.