My 2000 ford explorer won't unlock, what do you think the problem is?

My 2000 ford explorer won't unlock, what do you think the problem is?

What do you mean it won't unlock? It won't unlock via remote, key in the door, be specific.

If All the doors stopped working at the same time, check the master button on the driver's door. If just one, you'll have to take the door apart & see why it isn't working.