If it's a wooden door, it's more of a joinery problem than a locksmith
problem. If you want to diy, you need to find which bolt is stiff and
why. It may be the door has dropped on its hinges or has warped - or
on on some wooden doors the lockplates (that the bolts engage with)
have a small amount of position adjustment in them. One trick is to
remove the plates one by one and see if it frees up te mechanism at
all. You can leave that plate off for a while until you get a chippy
to fix the problem.