I usually just use fake Lurpak from Aldi for day-to-day sandwiches but for when I’m feeling fancy I keep a block of proper butter with salt crystals in it, in the fridge (I keep it in the fridge because one block lasts me months, no-one else eats it). I get it out hours in advance and even when it’s at room temperature it’s still hard enough that I could probably break a window with it. I’ve had my block out since yesterday morning and it’s still not spreadable 
Is there a trick to being able to use it or what?