2001 Taurus Wagon trunk power lock sticking

I have a 2001 taurus wagon and the trunk door won't lock from the clicker/keyless entry remote. I have to open the side door and crawl throught the trunk and open it by hand. Its a real pain lol. Is the actuator gone bad? It tries to lock because I see the knob go up but there isn't enough power it seems to actually lock the trunk. Any ideas? Thanks

Yes it's the actuator. Ford solenoid actuators don't last long. You cannot open the truck with the key?