How do you open trunk of is250 2009 manually when release button doesn't work?

To manually open the trunk of a 2009 Lexus IS250 when the release button isn't working, you can use the key fob to unlock the trunk by pressing the trunk release button. If that doesn't work, you can access the trunk through the rear seats by folding them down; look for a release lever or pull the rear seat backs to create an opening. If neither of these methods is possible, consider accessing the trunk lock mechanism directly from the outside with a slim jim or contacting a locksmith for assistance.