If its the old espace not espace IV, and the boot not open from the outside,you need to get into the back through the back seats try to remove the seats ,then you have to remove the tailgate trim remove the torx 20 screws you can see which hold the panel in place ,then when the panel is removed ,you need to locate the lock mechanisum rods or lever and pull untill you have released both sides ,then you need to look if you need to replace any parts or just give them some lube.
mark
April 2008