YOU SAID:

i will kill the next person to walk through that door

INTO JAPANESE

私はそのドアを通って歩くために次の人を殺します

BACK INTO ENGLISH

I kill the next person to walk through that door

INTO JAPANESE

私はそのドアを通って歩く次の人を殺します

BACK INTO ENGLISH

I kill the next person walking through that door

INTO JAPANESE

私はそのドアを歩いている次の人を殺します

BACK INTO ENGLISH

I will kill the next person walking through that door

INTO JAPANESE

私はそのドアを歩いている次の人を殺します

BACK INTO ENGLISH

I will kill the next person walking through that door