What's causing the sticking/jamming?
Most people who have food and drink around their computers will have this issue at one point or another. Myself included.
What I do is turn off the laptop, unplug and with it open I turn it upside down and run my hands gently but firmly over the entire keyboard, left to right then right to left. This usually dislodges crumbs and dust particles that can get underneath you keys and cause this to happen.
If we are talking about a sticky substance that has gotten on your keyboard, perhaps some pop that has spilled and has since dried, it only takes a drop. Then I would suggest a moist but not 'dripping' Q-Tip be applied to the specific key in question, you can gently insert the Q-Tip under the key in question and try to remove any sticky substance that may be there.
You can purchase cans of compressed air from computer stores (or Walmart) and then 'blow' whatever debris is in there out of the way.
Barring that you can always remove each key and clean it one at a time. it's tricky putting them back on with many laptop keyboards.
There are plastic overlays you can get from specialist computer stores (don't think you will find these at Walmart, but to be honest I never really looked for them there)
Or you can cover the keyboard with plastic wrap but be careful if your laptop heats up
hope this helps