Tow mirror stuck

Tried the search never seen anyone posts on this.
I can't get my drivers side mirror to pull(slide) out. It moved about a half inch and won't budge, wondering if temperature might help me tomor4ow when it heats up?
Should I spray some lubricant?
I pulling pretty hard , shaking the truck...it's worked in the past.

 

Found a good video on YouTube....think it was title tundra mirror fix, his truck was older then mine but the basics were close to the same. The bars mirrors slide on rust and the plastic gets jammed. Hardest parts were the end clip 9n the lower bar, the electrical connection on the motor and snapping the mirror back on. I can't lie , I brought the mirror(truck) to an auto glass shop and had the tech. snap it in place, thought I was going to break it.