Front passenger door lock won't lock/unlock

If it works from the inside but not with the key, it could be a broken link between the lock cylinder and the door latch.

change the batteries in the remotes

replace the central locking relay

The door gaskets could be frozen to the body, or you could have ice in the door latches.
Can you drive the car into a warm garage ?

DONT PULL THE lock / unlock button/tab TOO HARD. It will damage further.
Internal linkage/mechanism is not working... Get it repaired by mechanic.
If u want to do it yourself... may be this will help you out. Please refer images

You should replace power door lock at front passenger side, you can use any 'universal' power door lock. its an unit with a small motor inside that have a mechanism to up and down according electricity from the actuator (master door lock at driver side)
Hope this help :-)

You'll need to replace the solenoid (motor) that doesn't work. Not hard once you get the door panel off. I suggest you buy the correct part, not a universal one.

Check this site out
you need the passenger side door lock assembly kit.
There is one posted for sale in the US on this site. just scroll down for the following information and link
Used 1998 Toyota Avalon passenger door lock assembly 1998 Toyota Avalon
passenger door lock assembly
this is the part that surrounds the lock driver side. Car color is green cary, North Carolina 27513
The solenoid or actuator arm for the door lock assembly is probably not working to full spec.

Hope this helps.

thei are screws in the door hidden by caps that you need to take off the door and near the mirror shoud pop off