If Adsense finds any kind of fraudulent clicks on your ads, it will immediately place ad limitation on your site. Ad limitation is usually for 30 days, after 30 days period, ads will be enabled, and if you continue to get fraudulent clicks, your adsense account might be gone. Adsense will put ad limit on sites that use shady methods to get clicks. These tactics include asking others to click on ads, using automated programs to generate clicks, or using micro job sites to get clicks. If you're caught doing these things, Google AdSense will ban you sooner or later. Being banned means you won't be able to use AdSense again.