i just bought a "the colorpack" model land camera (for a quarter of a dollar!). i'm not even sure if it works or not. i was under the impression that the shutter will fire even without film for this model. the shutter is shut right now and nothing happens when the shutter button is pressed.
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You do not say what model. Assuming it is an all-plastic type, replace the shutter battery. It is in a compartment in the film chamber, toward the shutter, at the top. It is simply an AA battery. Clean the contacts. Those cameras are virtually indestructable.
If it is one of the foldables, the battery is in a chamber on the left side of the body as you are looking towards the viewfinder from the back.
On that, be careful about unclipping the wires. Sometimes the corrosion makes it difficult. Put in a three volt lithium battery, and tape the contacts to the battery with duct tape.