If the keys are touching, one of them is bent and needs to be straightened. Do not try to fix it with ordinary pliers or screwdriver. As a repair tech, some of the worst damage I see to musical instruments is caused by do-it-yourselfers. If you try to fix it yourself without knowing which one is the problem, you risk bending the wrong key, tearing a pad, bending a hinge rod, or otherwise making things worse. Also, key repairs require specialized skills and tools that you are not likely to have available to you.
"Never give a flute player a screwdriver."