2000 toyota echo door

put some WD40 in the lock keyholes I had same problem and that fixed it

Is it locked

This is what fixed the my car's driver's door that was stuck closed and locked: the plastic piece that function as the manual lock/unlock on the inside of the door (it's black but when the door's unlocked it has a red side facing out) had essentially popped out and everything was jammed. So you push the button back in while you flip the inside handle open. But maybe I was lucky, in that it was only the button that was jammed.

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 ?

try takeing the door panel off and check to see if the rod came out of the lock button.

Open the inside panel of the door by popping off the little white clips holding it on. The cable connected to the inside release button is either caught on something or has come lose. Check out this video - https://www.youtube.com/watch?v=MkC2OiOiE_U

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When you say it is broken do you mean it won't move into certain gears?

In past couple days our '04 Echo shifting lever won't go into Park or 2 or Lo gear. And we couldn't take the key out of the ignition. My husband took to center console cover off and when he loosened the bolt under the lever we were able to get it into park and get the key out. But still cannot get into the lower gears. Will probably be taking it to a transmission shop before making major decision.

If your's is an automatic trans, and it is locked in park, there is a small opening on the right/front side of the shifter, pop the top and press the white button, it releases the lever.

Good Luck!

When you try to unlock it.... Do you here it making any sound?

I haven't even been in a Echo, So I can't really know how its setup lol but, i can try and help. :)

When you try to unlock it from the inside of the car do you here any sounds? Does it turn Really easy? Maybe the rod unhooked from the lock,

Have you tried a coat hanger? To try and jigge it open ,

You can remove the seat. :) Might be alittle hard but, it will work so you can take the pannle off, If you take this step BE sure to Disconnected you're Battery.

Sounds like the most likely cause is the electronic lock actuator is bad. will have to take door panel appart to check.