you are likely to find Lock in/at/on Entrance. Lock is related to Keep. Keep is the opposite of Rid. Relieve is a type of Rid. 
one thing you do when you Thinking is Concentrate. Thinking requires Effort. Effort is a synonym of Pain. 
Entrance <--AtLocation-- Lock <--RelatedTo--> Keep <--Antonym--> Rid <--IsA-- Relieve 
Concentrate <--HasSubevent-- Thinking --HasPrerequisite--> Effort <--Synonym--> Pain 