Update with Lock

Good morning and good luck to all,SQL 2014:I have this problem:from my procedure in TSQL update the table TEST and where there is the PK of the table and so everything is right;If I try, from another session, to update the same table TEST, with a PK different course, it should not be left waiting for the procedure in terms TSQL;What's even stranger is that only with the Table TEST makes me, with other tables works great.Look kindly vs.