3 sentences

1. 你可以随时上门找我。

   nǐ kě​yǐ suí​shí shàng​mén zhǎo wǒ.

   You can come and visit me at any time.

   Source: Dong Chinese Dictionary

2. 由于出门走得太急，他竟然忘记了上门。

   yóu​yú chū​mén zǒu de tài jí, tā jìng​rán wàng​jì le shàng​mén.

   He left in such a hurry that he actually forgot to lock the door.

   Source: Dong Chinese Dictionary

3. 在那个村子里，男子去女方家里上门并不罕见。

   zài nà​ge cūn​zi lǐ, nán​zǐ qù nǚ​fāng jiā​lǐ shàng​mén bìng bù hǎn​jiàn.

   In that village, it is not uncommon for a man to marry into his wife's family.

   Source: Dong Chinese Dictionary