Do you hear any "unlock" noises when you press the unlock button? If so press unlock twice quickly. I had a bizarre thing happen to me... One day I can to unlock my car no doors opened at all (heard it unlock though) I assumed it was because the heat, using vinyl n rubber care on the seals and no use for three days or so.
After a few yanks I decided to open the door with the key and all doors from inside and I come to notice no doors would open except the drivers door now which baffled me boot included but the boot button did open it.
I tried degreasing the latches then greasing them up again and nothing still. After endless searching all suggests the modules didn't work but my issue was all doors not just one, I came across 1 comment saying he has to unlock his golf with a fast double unlock press and to my surprise that worked...
Its called selective unlocking I don't know how mine has came on exactly but it works like that now and no issues at all.