I am looking for a particular paper which will help me in my literature review of a current work. Are there ways in which we can get such papers that are usually locked or paid?
You may use Unpaywall to get full text of scholarly articles as you browse. Unpaywall points us to legal, author-posted manuscripts that are hosted on university and government web servers. These free, author-posted manuscripts are often called "Green Open Access" and are a longstanding and completely legal part of the scholarly communications ecosystem.
If you want to carry out Literature Survey, I Suggest you can search Shodh Ganga a reservoir of Indian Thesis, if you are looking for latest trends in your field you can go for Shodh Gangotri a collection synopsis submitted by Indian research scholars, apart from it If you want the access to Research Paper having subscription fees you can either visit your institution library or can get a letter from your Institution seeking permission to carry out literature survey in either of IITs, NITs where you can have a visitors access to such journals.