Not sure the model of laptop you have, however you should be able to gently release the keyboard from it's socket with a screwdriver and check underneath if there is something interfering with it.
Check google for a guide on how to do this and make sure you model has a removable keyboard.
If not, unfortunately this is an issue with laptops. The keyboards sometimes don't last and you can either repair it (depending on cost) or you need to replace it. My friend has used one with "O", "L" and some other keys not working for a bit. It is a pain