Provoke is a synonym of Stimulate. Stimulate is a type of Affect. Touch is a type of Affect. Touch is related to Use. 
Metal is related to Key. Key is related to Enter. Apartment can be used for Enter. you are likely to find Apartment in/at/on Town. 
Provoke <--Synonym--> Stimulate --IsA--> Affect <--IsA-- Touch <--RelatedTo--> Use 
Metal <--RelatedTo--> Key <--RelatedTo--> Enter <--UsedFor-- Apartment --AtLocation--> Town 