Car central locking HELP?

Hi, I have a 54 plate corsa c, 3dr car and the central locking is acting up when im in the car and try to open my door it automatically locks then the fob does not work it opens the doors but if you try and pull the handle of the driver鈥檚 door the full car locks again (if you try the passengers door then it opens fine) could someone help me find out what this could be? Because Arnold Clark are charging about 拢80 just to work out the problem then extra to fix it lol and I鈥檓 sure this must have happened to someone out there , thanks if you can help, Jon.|||If the inner lock button is not fully up then the door will not open.Try some wd 40 in the door lock to make sure its really free.To oil other parts would mean the inner door panel would need removed?hope this helps